Each marker on the ring is one counted review, coloured by its verdict.

Grand Seiko

Spring Drive U.F.A. Ushio 300 Diver

SLGB02340.8mmspring drive$12,400 list priceAnnounced April 2026

A 40.8mm titanium dive watch rated to 300m, with a blue gradient 'Ushio' (tide) dial and a ceramic 120-click bezel, and the smallest case of any Grand Seiko diver. It uses the no-date Spring Drive U.F.A. calibre 9RB1, rated to ±20 seconds per year, with the power-reserve indicator on the dial.

Grand Seiko product page

Creator Consensus

Very positive

8 reviews: 8 positive, 0 mixed, 0 negative. 8 of 8 recommend it.

Nearly all reviewers see the downsized case as answering long-standing collector requests, and the new clasp as fixing a familiar Grand Seiko weakness. Most also praise the practical micro-adjust and diver extension, Spring Drive accuracy beyond mechanical rivals, and a precise bezel action. The gradient Ushio dial and its lume draw praise from several reviewers, and every reviewer recommends it.

Where they differ. Value is the one real split. Several reviewers find the price steep, particularly against the Submariner, while a couple argue it undercuts earlier premium GS divers and offers more technology and materials for the money.

Most praised

Smaller case answers long-standing collector requests7 of 8
- SJX Watches Values the moderately sized case long wished for by collectors.a moderately sized caseRead it in context
- Time+Tide Calls the reduction to 40.8mm by 12.9mm a game-changer versus the earlier 43.8mm diver.This is game-changing, compared to the blue ushio 5-day SLGA023 diverRead it in context
- Time+Tide Feels the 40.8mm size finally delivers the proportions many buyers have long requested.to the sweet spot a sizeable audience has been begging the brand to doRead it in context
- Revolution Considers the roughly 40mm size a significant, welcome shift for a Grand Seiko diver.That alone is a significant shift.Read it in context
- Little Treasury Praises the reduced size compared with the older, larger Grand Seiko divers.This one finally brings the size down, keeps the real 300 m capabilityWatch from 5:44
- Teddy Baldassarre Considers the case dimensions the neatest ever for a Grand Seiko diver.the tidiest set of dimensions ever for aWatch from 4:20
- Ben's Watches Credits Grand Seiko for listening to collectors and shrinking the diver.Grand Seiko actually listened to collectors and implemented the smaller case diverWatch from 7:10
- Little Treasury On a 6.5-inch wrist it is exactly the size direction the reviewer wanted.On my 6 and 1/2 in wrist, this is exactly the direction I wantedWatch from 6:13
- Scott Adam Lancaster Likes the case and its proportions.the case and proportions of this watch is niceWatch from 2:23
New clasp fixes a long-standing GS weakness7 of 8
- SJX Watches Sees the new clasp as a big improvement over the thick old Marinemaster clasp.comes with an enormous improvement in build quality and comfortRead it in context
- Revolution Feels the clasp, historically a GS weak point, has now reached maturity.dive watch clasp has finally reached maturityRead it in context
- Monochrome Finds the micro-adjust and diver-extension clasp now equal in quality to the watch.the quality of the clasp is now totally on par with the rest of the watchRead it in context
- Ben's Watches Welcomes the micro-adjust given Grand Seiko's historically poor clasps.But the fact that this has the micro adjust, I think is great.Watch from 4:46
- Little Treasury Sees the clasp as Grand Seiko responding to long-standing customer requests.now it feels like they actually listenedWatch from 7:10
- Teddy Baldassarre Values the on-the-fly clasp micro-adjustment as fulfilling a common collector request.You have micro-adjustment in the clasp on the flyWatch from 13:00
- Scott Adam Lancaster Sees the bracelet as a genuine improvement over past Grand Seiko bracelets.a genuinely improved bracelet which actually feels nice on the wristWatch from 5:44
Micro-adjust and diver extension are genuinely practical6 of 8
- Time+Tide Credits the extension clasp as an evolution of last year's micro-adjust system.But it is actually an expansion and evolution of the clasp.Read it in context
- Little Treasury Loves the new diver-friendly clasp with micro-adjustment and a dive extension.a real diver-friendly clasp with micro-adjustment and extensionWatch from 7:10
- Ben's Watches Calls the 6mm micro-adjust the highlight of the watch.the 6 mm micro adjust is the home run hereWatch from 5:16
- Scott Adam Lancaster Finds the micro-adjust smooth and a pleasure to operate.the most beautifully engineered micro-adjust, which just glides into placeWatch from 3:49
- Revolution Values the added on-the-fly extension for wearing over a wetsuit or thick clothing.allowing a much larger adjustment range when wearing over a wetsuitRead it in context
- Teddy Baldassarre Likes the added dive-specific clasp features such as the diver extension and lock.we get even more bells and whistles appropriate for the dive watch genreWatch from 6:15
Accuracy beyond any mechanical rival6 of 8
- Time+Tide Impressed that it stays within chronometer-level tolerances per month rather than per day.yet per month, not per day, per month. Incredible.Read it in context
- Time+Tide Calls it the most accurate mainspring-driven dive watch available.the most accurate mainspring-driven dive watch in the worldRead it in context
- Monochrome Highlights that ±20 seconds per year is only the worst case.And that’s a worst-case scenario…Read it in context
- Monochrome Values precision beyond any purely mechanical movement.more precise than anything purely mechanicalRead it in context
- Little Treasury Considers 20 seconds per year of accuracy remarkable and unique among mainspring-powered watches.20 seconds per year in a main spring powered watch is the kind of specWatch from 6:13
- Teddy Baldassarre Believes its accuracy beats every competitor.unparalleled accuracy standards that leaves every competitor in the dustWatch from 13:00
- Scott Adam Lancaster Highlights the accuracy advantage over a Rolex Submariner.A significant difference in regards to accuracyWatch from 5:44
- Ben's Watches Rates the ±20 seconds per year accuracy highly.accurate to plus minus 20 seconds the entire year, which is pretty damn goodWatch from 0:56
- Time+Tide Argues highly regulated accuracy is what makes a dive watch a legitimate tool.legitimate, highly-regulated accuracy to really put the tool in tool watchRead it in context
Precise, satisfying bezel action5 of 8
- Time+Tide Likes the 120-click bezel's precise adjustment, grippy knurling and feel in hand.its knurling makes it easy to grip. It feels great in-handRead it in context
- Little Treasury Notes that the bezel clicks are precise and sound good.However, the clicks are very precise and it does sound goodWatch from 3:46
- Scott Adam Lancaster Finds the bezel action delightful to use.A beautifully engineered divers or which just feels dreamy to useWatch from 5:44
- Ben's Watches Considers the 120-click bezel action quite good.I actually think the bezel action on this watch is quite goodWatch from 3:19
- Teddy Baldassarre Appreciates the lower-profile bezel with refined, grippier teeth.the teeth have also been refined for better gripWatch from 5:45
Wears well across a wide range of wrists4 of 8
- Revolution Believes the size suits a much wider range of wrists than previous GS divers.a far more wearable size for a much wider range of wristsRead it in context
- Ben's Watches Finds the 40.8mm, sub-13mm case wearable on many wrist sizes.this is wearable for a variety of different wrists, including myselfWatch from 7:10
- Monochrome Wears comfortably on the reviewer's 16.5cm wrist.Even on my relatively small 16.5cm wrist, these two models wear comfortablyRead it in context
- Scott Adam Lancaster Wears much smaller than its stated diameter on a 7.5-inch wrist.although it says 40.8, it actually wears a lot smallerWatch from 0:57

Show 25 more

Gradient dial has rich depth and play of light4 of 8
- Time+Tide Describes the blue gradient as subtle yet deeply rich.the blue feels less dramatic, yet it is so rich and swallows you inRead it in context
- Monochrome Feels the gradient adds personality and contrast with markers and hands.adding more personality, while the darker edges create strong contrastRead it in context
- Teddy Baldassarre Admires the gradient Ushio pattern and its shifts in changing light.getting a beautiful gradation effectWatch from 7:13
- Revolution Appreciates the layered lacquer giving the wave pattern a glazed surface.to create a surface that feels almost glazedRead it in context
Lume is bright and generously applied4 of 8
- SJX Watches Notes generous lume on the hands and all hour markers.endowed with a generous amount of green LumibriteRead it in context
- Little Treasury Finds the lume vivid.Watch from 4:44
- Teddy Baldassarre Considers the applied indices a highlight and the lume exceptionally bright.always a highlight of any GS dialWatch from 8:11
- Scott Adam Lancaster Notes excellent lume.excellent loom as you would expectWatch from 5:44
Water resistance is robust and uncompromising4 of 8
- SJX Watches Considers the 300 m rating likely very conservative.A 300 m depth rating (likely very conservative)Read it in context
- Monochrome Considers 300m water resistance the right, uncompromising level.not compromising here, with a 300m water-resistanceRead it in context
- Scott Adam Lancaster Appreciates the 300m water resistance.300 m water resistance, which is very niceWatch from 5:44
- Teddy Baldassarre Notes water resistance improves despite the smaller case.the Ushio actually improves in the water resistance departmentWatch from 4:48
Case conforms closely to the wrist3 of 8
- SJX Watches Says the case conforms to the wrist better than the slab-like Submariner.the case hugs the wrist more than the slab-like Submariner caseRead it in context
- Scott Adam Lancaster Feels integrated with the wrist rather than a bulky lump of metal.it feels more like an extension of your wristWatch from 0:57
- Monochrome Finds the new case lighter, more ergonomic and airier than previous GS divers.the case feels lighter, more ergonomic, more airy than beforeRead it in context
Titanium makes it light and comfortable3 of 8
- Revolution Finds the lightweight titanium case and bracelet make it genuinely comfortable.This makes it a genuinely comfortable everyday diverRead it in context
- Teddy Baldassarre Notes the titanium makes it feel lightweight.The overall effect comes across as lightweight yet shiningWatch from 5:18
- Monochrome Finds the wearing experience comparable to a modern Submariner, with added titanium lightness.the benefits of titanium and its lightnessRead it in context
Smaller case keeps its rugged, robust character3 of 8
- SJX Watches Finds the case solidly built.The case is still solidly builtRead it in context
- Time+Tide Feels the smaller case keeps Grand Seiko's expected robustness and elegance.Grand Seiko has retained all of the robustness and elegance we expectRead it in context
- Revolution Notes the smaller case keeps its rugged character with more controlled angular lugs and bevels.in becoming smaller, it does not lose any of its rugged characterRead it in context
Among the best-finished dive watch cases3 of 8
- Time+Tide Believes no other brand's dive watch case is better finished.there is no dive watch case from any other brand in the world that is better finishedRead it in context
- Ben's Watches Agrees it may be the best-finished dive watch case, above a pricier Blancpain.there's just no way it's better than this and that's $6,000 moreWatch from 1:53
- Scott Adam Lancaster Rates the refinement and finish at the top of the diver market.as refined and as well-finished as any other watch in the dive watch marketWatch from 6:13
Ushio pattern feels organic and well integrated3 of 8
- Time+Tide Finds the ushio pattern natural and evocative of calm water, like a painting of tides.It is almost like a photorealistic painting of the tides.Read it in context
- Scott Adam Lancaster Finds the wave texture organic rather than gimmicky, unlike other wave dials.It actually looks elegant and classy.Watch from 3:49
- Revolution Feels the pattern is better integrated than on some Grand Seiko dials, not dominating.Here, however, the execution feels better integrated.Read it in context
Broad hands and large indices aid legibility3 of 8
- Time+Tide Praises the large lumed indices and rehaut minute track for legibility without cluttering the pattern.ample Lumibrite for unquestionable legibility in any lighting conditionRead it in context
- Teddy Baldassarre Finds the redesigned hands broad and very legible.The brushed titanium hands are broad and highly legibleWatch from 8:40
- Monochrome Praises the new faceted rectangular indexes as brighter and more consistent.these offer more luminous surfaces and more consistencyRead it in context
No-date layout is cleaner and better balanced3 of 8
- SJX Watches Likes the enthusiast-favoured no-date format.an enthusiast-favourite no-date formatRead it in context
- Monochrome Likes the no-date layout, which allows lumed markers all around.A nice touch, Grand Seiko went for a no-date displayRead it in context
- Teddy Baldassarre Welcomes the absence of a date, which gives the indices more room.The dial does away with a date complication to allow indices extra breathing roomWatch from 8:40
Cohesive, well-balanced overall package3 of 8
- SJX Watches Sees the package as delivering everything Grand Seiko collectors have long wanted.combining everything Grand Seiko collectors have longed forRead it in context
- Revolution Feels the watch hits the sweet spot in size, style, material and movement.finally seems to hit the sweet spot from every angleRead it in context
- Revolution Sees the design as a deliberate balance between expressive and restrained.it lands in a very deliberate middle groundRead it in context
- Monochrome Sees the design as more pleasant and coherent than before.visually more pleasant and more consistent, yet still very capableRead it in context
Works as an everyday watch beyond diving3 of 8
- Revolution Calls it almost a desk diver, meant positively, suited to everyday wear.almost a desk diver in the best senseRead it in context
- Monochrome Sees it as a viable daily driver or weekend watch.can easily be considered daily drivers or weekend watchesRead it in context
- Monochrome Notes it is no longer confined to diving and works in town.they are no longer relegated to this sole role and can be worn in townRead it in context
- Teddy Baldassarre Considers the blue the more sensible colour for daily wear and versatility.the more cerebral choice of the two when it comes to day-to-day wearability and versatilityWatch from 13:28
Crisp contrast of Zaratsu-polished bevels and brushing2 of 8
- Time+Tide Admires the faceted geometry and crisp contrast between brushed and mirror-polished surfaces.highly faceted and impeccably zaratsu-finishedRead it in context
- Teddy Baldassarre Praises the Zaratsu polishing on the flared bevels.the flared bevels showing Grand Seiko's masterful ZaratsuWatch from 4:48
Dial is the centrepiece that sets it apart2 of 8
- Little Treasury Feels the blue Ushio dial lifts it above a generic luxury diver.the blue Ushio dial makes it feel like more than just another luxury diverWatch from 6:41
- Scott Adam Lancaster Considers the dial the main attraction of the watch.the dial is by far the star of the showWatch from 2:23
Green dial is unconventional for a GS diver2 of 8
- Scott Adam Lancaster Especially fond of the green dial's unconventional sunset-like character.just has this kind of evening sunset vibeWatch from 2:52
- Teddy Baldassarre Finds the green dial unlike anything Grand Seiko has done in dive watches.unlike anything Grand Seiko has done to this pointWatch from 13:28
Smooth Spring Drive sweep suits the water theme2 of 8
- Little Treasury Enjoys the smooth Spring Drive seconds hand gliding over the dial.that smooth Spring Drive seconds hand moving across itWatch from 6:41
- Scott Adam Lancaster Feels the smooth sweep suits the watch's water-inspired theme.the motion just kind of enhances it just a little bit moreWatch from 5:16
Evolution 9 design language suits a diver2 of 8
- Revolution Values the long-awaited alignment of Evolution 9 design language with a dive watch.a long-awaited alignment of design language and purposeRead it in context
- Time+Tide Though not always a fan of the Evolution 9 hands, thinks they make sense on a diver.within the context of a full-on sporty dive watch, it makes absolute senseRead it in context
- Revolution Finds the angular Evolution 9 indices natural on a dive watch.those markers can feel bold on dressier pieces, they feel entirely natural hereRead it in context
Bezel numerals and notches carefully designed2 of 8
- Revolution Likes the trapezoidal bezel notches and their careful spacing.The spacing is precise and consideredRead it in context
- Ben's Watches Loves the bezel numerals, font, knurling and graduations.I love the numerals. I love the font.Watch from 3:19
Discreet, well-conceived clasp locking system2 of 8
- SJX Watches Likes that the sliding security lock won't scratch the bracelet.This arrangement can’t scratch the bracelet like the usual flip-over locking mechanism can.Read it in context
- SJX Watches Judges the twin-trigger system secure enough even without the lock.the twin trigger system alone is secure enough for a dive watchRead it in context
- Scott Adam Lancaster Praises the discreetly hidden locking mechanism as best-in-class among divers.the most elegant locking system that I think is availableWatch from 3:49
More pronounced bracelet taper2 of 8
- Time+Tide Perceives a stronger taper than on larger Evolution 9 bracelets and expects buyers to appreciate it.it feels like there is a stronger taper than what you would findRead it in context
- Monochrome Welcomes the more pronounced taper versus other Evolution 9 bracelets.is a more pronounced tapering effectRead it in context
Less recessed crown is easier to grip2 of 8
- Monochrome Welcomes the crown being less recessed within the guards for easier grip.but less than before for easier gripRead it in context
- Teddy Baldassarre Likes the partially guarded crown's strong grip.offering fantastic grip and signed with the GS logo in reliefWatch from 5:18
Distinctly Grand Seiko rather than Submariner-derived2 of 8
- Monochrome Believes the GS character remains strongly present.the GS touch is still very much aliveRead it in context
- Scott Adam Lancaster Contrasts it with the many safe, Submariner-derived divers.Grand Seiko, like most of their pieces, pushes the boundariesWatch from 2:23
- Scott Adam Lancaster Credits Grand Seiko for doing its own thing rather than following trends.Grand Seiko with this new dive watch is not just chasing trendsWatch from 6:13
Priced below earlier premium GS divers2 of 8
- SJX Watches Finds the price surprisingly lower than Grand Seiko's existing premium divers.Perhaps most surprising is the priceRead it in context
- Ben's Watches Considers the price fair given movement, finishing and the price drop versus its predecessor.Grand Seiko is not overcharging you hereWatch from 7:39
Delivers more technology and materials for the money2 of 8
- Time+Tide Thinks the price buys unmatched accuracy, titanium, 300m and a stunning dial, covering every need.It ticks all the boxes.Read it in context
- Monochrome Argues it delivers more technology, precision and materials for the money.Then, the GS offers more in terms of technology, precision and materials.Read it in context
Distils Seiko dive heritage into GS execution1 of 8
- Revolution Views it as decades of Seiko dive-watch development distilled into a cohesive form.distilled into a refined and cohesive formRead it in context
- Revolution Feels it elevates Seiko's tool-watch ethos to Grand Seiko's level of execution.a higher level of execution under Grand SeikoRead it in context

Most criticised

Price is steep, particularly against the Submariner4 of 8
- Monochrome Notes the price is high, especially against the Submariner Date.It isn’t cheap on paperRead it in context
- Teddy Baldassarre Notes UFA makes it a top-shelf offering at a higher price.the UFA being a top-shelf offering, which will lead to a higher priceWatch from 12:30
- Scott Adam Lancaster Finds the price too high, stopping a personal purchase.it's 12,500 USD. And that ain't cheap.Watch from 6:41
- Scott Adam Lancaster Feels Grand Seiko may have overpriced it relative to competition.do you feel like it's maybe overpriced itself a little bit?Watch from 8:08
- Ben's Watches Thinks the cheaper Submariner is the better overall buy on servicing and resale.And I do think the sub is a better watch.Watch from 9:35
Movement hidden behind a solid caseback1 of 8
- Ben's Watches Dislikes that the finely finished movement is hidden behind a solid caseback.one of the best finished movements in a dive watch in the world and you can't see any of itWatch from 8:08
- Ben's Watches Slightly disappointed by the lack of a display back despite understanding the water-resistance reasons.I was slightly disappointedWatch from 8:37
Odd lug width limits strap options1 of 8
- Ben's Watches Finds the 21mm lug width odd, limiting strap options.the 21 mm is a little bit odd for something like thatWatch from 6:41
Bezel scale lacks full lume1 of 8
- Monochrome Would have preferred a fully lumed bezel scale rather than just the pip.A fully-lumed scale would have been pleasant.Read it in context

Open a point to see who said it and jump to that moment in their review.

By aspect

PositiveMixedNegative

How reviewers judged each aspect; one square per reviewer who discussed it
Case & proportions		Praised
Wearability		Praised
Bracelet & strap		Praised
Dial		Praised
Movement		Praised
Functionality		Praised
Value		Mixed
Design		Praised
Originality		Praised
Finishing & build		Praised
Versatility		Mostly liked

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The reviews

8 counted

Remontoir summarises; the reviewers did the work. Watch and read the originals for the full picture.

Ben's Watches

Grand Seiko's Best Diver Ever. I Still Wouldn't Buy It.

Video, 13 minHands-on reviewAug 2026

PositiveRecommends, with caveats

Calls it the best Grand Seiko diver ever, fairly priced, beautifully finished and finally wearably sized with a great micro-adjust clasp. Won't buy it: the closed caseback hides the movement, the premium over cheaper options is questionable, and scratch-prone titanium makes it feel like a dressy diver.

Suits: Collectors who baby their watches and wear a diver occasionally

What they said, point by point

Finishing & buildpositive: Finds the highly polished finishing unnecessary on a tool watch but visually excellent. 3:19
Agrees it may be the best-finished dive watch case, above a pricier Blancpain. 1:53
Designpositive: Loves the bezel numerals, font, knurling and graduations. 3:19
Feels the bezel is distinctly Grand Seiko yet with a classic Swiss feel. 3:19
Having seen the green dial in person, prefers it to the blue. 1:25
Functionalitymixed: Considers the 120-click bezel action quite good. 3:19
Still prefers the Rolex Submariner's bezel action. 3:19
Finds lume only on the bezel pip odd, but doesn't personally care. 3:49
Movementmixed: Rates the ±20 seconds per year accuracy highly. 0:56
Dislikes that the finely finished movement is hidden behind a solid caseback. 8:08
Slightly disappointed by the lack of a display back despite understanding the water-resistance reasons. 8:37
Bracelet & strappositive: Calls the 6mm micro-adjust the highlight of the watch. 5:16
Welcomes the micro-adjust given Grand Seiko's historically poor clasps. 4:46
Sees the 18mm wetsuit extension as a novelty most won't use. 4:46
Case & proportionspositive: Credits Grand Seiko for listening to collectors and shrinking the diver. 7:10
Likes the drilled lugs for easier strap changes. 6:41
Finds the 21mm lug width odd, limiting strap options. 6:41
Wearabilitypositive: Finds the 40.8mm, sub-13mm case wearable on many wrist sizes. 7:10
Originalitypositive: Enjoys the vintage touch of drilled lugs on an otherwise modern watch. 6:41
Valuemixed: Considers the price fair given movement, finishing and the price drop versus its predecessor. 7:39
Questions paying about $5,000 more than a titanium Shunbun. 10:03
Thinks the cheaper Submariner is the better overall buy on servicing and resale. 9:35
Versatilitynegative: Worries the titanium will scratch easily when worn hard. 11:02
Sees it as a dress watch in diver form rather than a tool to beat up. 11:31
Suggests it suits those who baby their watches. 12:00
Compared with: Rolex Submariner: Submariner judged better for servicing, resale, wear-anywhere use and bezel feel.
Blancpain Fifty Fathoms Bathyscaphe: Believes the GS case finishing beats the $6,000-pricier Blancpain.
Grand Seiko Shunbun (titanium): Questions whether the $5,000 premium over the Shunbun is worthwhile.

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Little Treasury

Is Grand Seiko's New Ushio 300 SLGB023 Really That Good? We find out in our Full Review

Video, 9 minHands-on reviewJun 2026

Very positiveRecommends

Sees this as the Grand Seiko diver many have been waiting for. It is smaller than the older divers, light in titanium, extremely accurate thanks to UFA Spring Drive, and finally has a proper diver clasp. The only quibbles are a very stiff bezel and a slightly less textured dial.

Suits: Those wanting a Grand Seiko diver who found the older ones too big

Disclosure: Retailer stock

What they said, point by point

Case & proportionspositive: Praises the reduced size compared with the older, larger Grand Seiko divers. 5:44
Likes the sharp presence of the Evolution 9 case. 6:41
Functionalitymixed: Finds the bezel very tight, almost too tight to turn easily. 3:46
Notes that the bezel clicks are precise and sound good. 3:46
Movementpositive: Considers 20 seconds per year of accuracy remarkable and unique among mainspring-powered watches. 6:13
Wearabilitypositive: On a 6.5-inch wrist it is exactly the size direction the reviewer wanted. 6:13
Dialpositive: Feels the blue Ushio dial lifts it above a generic luxury diver. 6:41
Notes the dial is less textured and slightly darker than the SLGA023's. 6:41
Enjoys the smooth Spring Drive seconds hand gliding over the dial. 6:41
Finds the lume vivid. 4:44
Bracelet & strappositive: Loves the new diver-friendly clasp with micro-adjustment and a dive extension. 7:10
Sees the clasp as Grand Seiko responding to long-standing customer requests. 7:10
Compared with: Grand Seiko SLGA023: The predecessor's dial is more textured; the new one is slightly darker.

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Teddy Baldassarre

The New Standard for Japanese Luxury Dive Watches - Grand Seiko Ushio 300

Video, 16 minHands-on reviewJun 2026

Very positiveRecommends

Sees the Ushio 300 as Grand Seiko finally answering fan requests for a smaller diver with on-the-fly micro-adjustment. Praises the dial, finishing, fit and class-leading accuracy, while noting the premium price and the shorter three-day power reserve.

Suits: Experienced collectors wanting a premium, wearable Spring Drive diver.

Disclosure: Retailer stock

What they said, point by point

Case & proportionspositive: Considers the case dimensions the neatest ever for a Grand Seiko diver. 4:20
Likes the partially guarded crown's strong grip. 5:18
Appreciates the lower-profile bezel with refined, grippier teeth. 5:45
Wearabilitypositive: Finds it wears true to its size, helped by a wide bezel that makes the dial look smaller. 5:45
Notes the titanium makes it feel lightweight. 5:18
Finishing & buildpositive: Praises the Zaratsu polishing on the flared bevels. 4:48
Finds the titanium far more refined and brilliant than tool-like titanium. 5:18
Dialpositive: Admires the gradient Ushio pattern and its shifts in changing light. 7:13
Considers the applied indices a highlight and the lume exceptionally bright. 8:11
Finds the redesigned hands broad and very legible. 8:40
Welcomes the absence of a date, which gives the indices more room. 8:40
Bracelet & strappositive: Would keep the bracelet on rather than swapping straps, finding the package complete. 6:44
Values the on-the-fly clasp micro-adjustment as fulfilling a common collector request. 13:00
Movementpositive: Believes its accuracy beats every competitor. 13:00
Sees the drop to three days of power reserve as a reasonable trade-off. 12:02
Functionalitypositive: Notes water resistance improves despite the smaller case. 4:48
Likes the added dive-specific clasp features such as the diver extension and lock. 6:15
Versatilitypositive: Considers the blue the more sensible colour for daily wear and versatility. 13:28
Notes the green may not be as versatile as the blue. 13:57
Originalitypositive: Finds the green dial unlike anything Grand Seiko has done in dive watches. 13:28
Sees the Ushio as standing apart from peers that appeal to different ideals. 13:00
Valuemixed: Notes UFA makes it a top-shelf offering at a higher price. 12:30
Expects it is unlikely to be anyone's first luxury watch. 12:30
Compared with: Grand Seiko SLGA023 (Ushio 43.8mm): New model is smaller in every dimension and has better water resistance.
Rolex Submariner: Named as a peer in the premium dive watch class.
Glashütte Original SeaQ: Named as a peer in the premium dive watch class.
Blancpain Fifty Fathoms: Peer seen as sitting more in a haute horology genre.

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Scott Adam Lancaster

The New Grand Seiko Diver Has 1 Flaw Nobody's Talking About (And It's A Dealbreaker)

Video, 8 minHands-on reviewMay 2026

PositiveRecommends, with caveats

Considers it one of the best dive watches available, praising its compact wear, organic wave dial, clasp engineering, improved bracelet and Spring Drive. However, the $12,500 price is a personal dealbreaker given many cheaper strong alternatives.

Suits: Buyers with ample budget wanting a refined, compact, technically advanced diver

Disclosure: Hands-on at launch event

What they said, point by point

Wearabilitypositive: Wears much smaller than its stated diameter on a 7.5-inch wrist. 0:57
Feels integrated with the wrist rather than a bulky lump of metal. 0:57
Likes that it feels heavier and more solid than typical titanium Grand Seikos. 1:26
Dialpositive: Considers the dial the main attraction of the watch. 2:23
Especially fond of the green dial's unconventional sunset-like character. 2:52
Finds the wave texture organic rather than gimmicky, unlike other wave dials. 3:49
Notes excellent lume. 5:44
Case & proportionspositive: Likes the case and its proportions. 2:23
Bracelet & strappositive: Finds the micro-adjust smooth and a pleasure to operate. 3:49
Praises the discreetly hidden locking mechanism as best-in-class among divers. 3:49
Sees the bracelet as a genuine improvement over past Grand Seiko bracelets. 5:44
Movementpositive: Feels the smooth sweep suits the watch's water-inspired theme. 5:16
Highlights the accuracy advantage over a Rolex Submariner. 5:44
Functionalitypositive: Finds the bezel action delightful to use. 5:44
Appreciates the 300m water resistance. 5:44
Finishing & buildpositive: Rates the refinement and finish at the top of the diver market. 6:13
Originalitypositive: Contrasts it with the many safe, Submariner-derived divers. 2:23
Credits Grand Seiko for doing its own thing rather than following trends. 6:13
Valuenegative: Finds the price too high, stopping a personal purchase. 6:41
Suggests buying pre-owned later at a discount instead of paying retail. 7:39
Feels Grand Seiko may have overpriced it relative to competition. 8:08
Compared with: Rolex Submariner: Spring Drive far more accurate than the Submariner's ±2 s/day.
Rolex Submariner: Similar retail price makes buyers cross-shop them despite differences.
Longines HydroConquest: Does the same job and looks great for a fraction of price.
Tudor Pelagos: Cited as a much cheaper alternative with a great T-fit clasp.

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SJX Watches

Hands On: Grand Seiko Spring Drive UFA Ushio 300 Diver SLGB025 and SLGB023

ArticleHands-on reviewApr 2026Andrew Cavanaugh

Very positiveRecommends

Calls this Grand Seiko's best dive watch yet. It fixes past weaknesses with a moderate, wrist-hugging titanium case, a much-improved clasp, 300 m rating and no-date format. Impeccable dial work, clever movement engineering and a surprisingly lower price make it highly competitive.

Suits: Grand Seiko collectors wanting a moderately sized, 300 m no-date diver

What the review says, point by point

Designpositive: Likes the enthusiast-favoured no-date format.
Sees the package as delivering everything Grand Seiko collectors have long wanted.
Notes the new utilitarian handset replaces the cathedral hands of earlier GS divers.
Dialpositive: Considers the dial execution impeccable, as usual for the brand.
Points out that a black Kuroshio dial option is missing from the lineup.
Notes generous lume on the hands and all hour markers.
Case & proportionspositive: Values the moderately sized case long wished for by collectors.
Describes the redesigned case as longer and leaner than the cushion-like five-day cases.
Finds the case solidly built.
Wearabilitypositive: Says the case conforms to the wrist better than the slab-like Submariner.
Bracelet & strappositive: Sees the new clasp as a big improvement over the thick old Marinemaster clasp.
Likes that the sliding security lock won't scratch the bracelet.
Judges the twin-trigger system secure enough even without the lock.
Notes the bracelet is little changed apart from a more noticeable taper.
Movementpositive: Highlights the clever protruding-barrel design as an example of good engineering.
Notes it is the thinnest self-winding Spring Drive, thanks to the no-date design.
Functionalitypositive: Considers the 300 m rating likely very conservative.
Notes it is a normal dive watch without helium protection, unlike saturation divers.
Valuepositive: Finds the price surprisingly lower than Grand Seiko's existing premium divers.
Suggests the missing date may explain the discount, as with Submariner versus Submariner Date.
Compared with: Rolex Submariner: Similar dimensions, but the GS case hugs the wrist more.
Grand Seiko Evolution 9 Spring Drive 5 Days Ushio Diver: New model is smaller, slimmer, leaner and slightly cheaper.

Read on watchesbysjx.com

Revolution

A Closer Look: Grand Seiko “Ushio” Diver Spring Drive U.F.A.

ArticleHands-on reviewApr 2026Lee Sheng

Very positiveRecommends

Sees the 40.8mm all-titanium Ushio as Grand Seiko's most resolved diver yet. It has the right size, a coherent angular design from case to dial, a well-integrated wave dial and a mature clasp, and feels like the culmination of Seiko's dive-watch heritage.

Suits: Collectors wanting a wearable, lightweight everyday diver with Seiko heritage

What the review says, point by point

Designpositive: Feels the watch hits the sweet spot in size, style, material and movement.
Sees the design as a deliberate balance between expressive and restrained.
Values the long-awaited alignment of Evolution 9 design language with a dive watch.
Case & proportionspositive: Considers the roughly 40mm size a significant, welcome shift for a Grand Seiko diver.
Notes the smaller case keeps its rugged character with more controlled angular lugs and bevels.
Likes the trapezoidal bezel notches and their careful spacing.
Dialpositive: Finds the angular Evolution 9 indices natural on a dive watch.
Appreciates the layered lacquer giving the wave pattern a glazed surface.
Feels the pattern is better integrated than on some Grand Seiko dials, not dominating.
Wearabilitypositive: Believes the size suits a much wider range of wrists than previous GS divers.
Finds the lightweight titanium case and bracelet make it genuinely comfortable.
Bracelet & strappositive: Values the added on-the-fly extension for wearing over a wetsuit or thick clothing.
Feels the clasp, historically a GS weak point, has now reached maturity.
Versatilitypositive: Calls it almost a desk diver, meant positively, suited to everyday wear.
Originalitypositive: Views it as decades of Seiko dive-watch development distilled into a cohesive form.
Feels it elevates Seiko's tool-watch ethos to Grand Seiko's level of execution.
Compared with: Grand Seiko SBGA229: Ushio is more rugged and resolved; SBGA229 never felt definitive.
Grand Seiko SBGH229: Ushio's case is more rugged than this similar Hi-Beat.
Grand Seiko SLGA001: Ushio is more restrained, landing in a middle ground.

Read on revolutionwatch.com

Monochrome

The Grand Seiko Spring Drive UFA Ushio 300 Diver, GS’ Smallest and Most Accurate Dive Watch

ArticleHands-on reviewApr 2026Brice Goulard

Very positiveRecommends

Sees the Ushio 300 as the GS diver collectors asked for: compact, comfortable, versatile, precise and well equipped with a proper micro-adjust clasp. It is hard to fault objectively; the pricier ask versus the Submariner is offset by more technology and materials.

Suits: Those wanting a compact luxury 300m diver for daily wear, including smaller wrists

What the review says, point by point

Case & proportionspositive: Finds the new case lighter, more ergonomic and airier than previous GS divers.
Welcomes the crown being less recessed within the guards for easier grip.
Considers the high-intensity titanium case a competitive advantage.
Wearabilitypositive: Wears comfortably on the reviewer's 16.5cm wrist.
Finds the wearing experience comparable to a modern Submariner, with added titanium lightness.
Versatilitypositive: Sees it as a viable daily driver or weekend watch.
Notes it is no longer confined to diving and works in town.
Functionalitypositive: Considers 300m water resistance the right, uncompromising level.
Would have preferred a fully lumed bezel scale rather than just the pip.
Likes the no-date layout, which allows lumed markers all around.
Dialpositive: Feels the gradient adds personality and contrast with markers and hands.
Praises the new faceted rectangular indexes as brighter and more consistent.
Finds the power reserve indicator odd on a diver, but rooted in brand DNA.
Movementpositive: Highlights that ±20 seconds per year is only the worst case.
Values precision beyond any purely mechanical movement.
Bracelet & strappositive: Welcomes the more pronounced taper versus other Evolution 9 bracelets.
Finds the micro-adjust and diver-extension clasp now equal in quality to the watch.
Designpositive: Sees the design as more pleasant and coherent than before.
Originalitypositive: Believes the GS character remains strongly present.
Valuemixed: Notes the price is high, especially against the Submariner Date.
Argues it delivers more technology, precision and materials for the money.
Compared with: Rolex Submariner Date: Comparable wearing experience, but GS adds titanium lightness.
Rolex Submariner Date: Sub is cheaper, but GS offers more technology, precision and materials.
Grand Seiko Ushio 200m Diver SLGA015: New model is more compact and refined than the larger earlier Ushio.

Read on monochrome-watches.com

Time+Tide

Grand Seiko finally has a Spring Drive dive watch in a 40.8mm size

ArticleHands-on reviewApr 2026Zach Blass

Very positiveRecommends

Thrilled that Grand Seiko finally offers a Spring Drive diver at 40.8mm. Praises the class-leading case finishing, captivating ushio dial, extraordinary U.F.A. accuracy, tapered bracelet and clasp. The only quibble is the lumed seconds counterweight, called very minor.

Suits: Buyers who loved Grand Seiko divers but found 44mm-class sizes too big

What the review says, point by point

Case & proportionspositive: Calls the reduction to 40.8mm by 12.9mm a game-changer versus the earlier 43.8mm diver.
Feels the smaller case keeps Grand Seiko's expected robustness and elegance.
Likes the 120-click bezel's precise adjustment, grippy knurling and feel in hand.
Welcomes the solid caseback for the thickness it saves on a dive watch.
Finishing & buildpositive: Believes no other brand's dive watch case is better finished.
Admires the faceted geometry and crisp contrast between brushed and mirror-polished surfaces.
Dialpositive: Finds the ushio pattern natural and evocative of calm water, like a painting of tides.
Describes the blue gradient as subtle yet deeply rich.
Praises the large lumed indices and rehaut minute track for legibility without cluttering the pattern.
Dislikes that the lume sits on the seconds counterweight, though understands the technical reason.
Designpositive: Though not always a fan of the Evolution 9 hands, thinks they make sense on a diver.
Movementpositive: Impressed that it stays within chronometer-level tolerances per month rather than per day.
Calls it the most accurate mainspring-driven dive watch available.
Functionalitypositive: Argues highly regulated accuracy is what makes a dive watch a legitimate tool.
Notes the lumed counterweight's role is to show the watch is still running underwater.
Bracelet & strappositive: Perceives a stronger taper than on larger Evolution 9 bracelets and expects buyers to appreciate it.
Credits the extension clasp as an evolution of last year's micro-adjust system.
Wearabilitypositive: Feels the 40.8mm size finally delivers the proportions many buyers have long requested.
Valuepositive: Thinks the price buys unmatched accuracy, titanium, 300m and a stunning dial, covering every need.
Compared with: Grand Seiko SLGA023: Far smaller than the 43.8mm SLGA023, whose 51.5mm lugs intimidate average wrists.

Read on timeandtidewatches.com

Specifications

Reference: SLGB023
Case: 40.8mm, High-Intensity Titanium
Thickness: 12.9mm
Lug to lug: 48.5mm
Movement: Grand Seiko 9RB1 Spring Drive U.F.A. (spring drive)
Power reserve: 72 hours
Water resistance: 300m
Crystal: sapphire (inner AR coating)
Bracelet or strap: High-Intensity Titanium bracelet, locking extension clasp with micro-adjustment (6mm) and diver extension (18mm)
Announced: April 2026
List price (US): $12,400US$12,400 (excl.

Creator Consensus is built only from what reviewers said. Prices, retailers and any commercial relationship never affect it. How consensus works