Grand Seiko

Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB025

Name: Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB025 SLGB025
Brand: Grand Seiko
SKU: SLGB025

Ref. SLGB025

2026–present · 40.8mm · caliber Grand Seiko Cal. 9RB1: Spring Drive, self-winding with manual-winding, 72h PR, 33j; U.F.A. accuracy of ±20 seconds per year, power-reserve indicator

Find similar

Mass-produced

Live pricing is coming soon. Get notified when it is available for this reference.

Movement tier: unclassified · caliber Grand Seiko Cal. 9RB1: Spring Drive, self-winding with manual-winding, 72h PR, 33j; U.F.A. accuracy of ±20 seconds per year, power-reserve indicator · 72h power reserve (3 days)

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

40.8 mm case. 21 mm lug width. Wears confidently on average to larger wrists. May overhang on slender builds.

Not yet rated

Community + OSINT signals haven’t landed for this reference yet. We don’t publish a rating against zero signal: the number would mean nothing. Editorial body + caliber + market value still surface above; ratings appear once the signal corpus does.

Search pre-owned listings

Chrono24

eBay (sold listings)

WatchBox

Authentication

Mechanically identical to the SLGB023 and everything in that entry applies unchanged. What is specific here is that the green execution is sold only through Grand Seiko boutiques and Master Shops, which makes provenance worth more than usual.

Known issues in the market

The seconds hand glides rather than ticks, as on every Spring Drive. A visible step means the movement is not running correctly.
Boutique-and-Master-Shop-only distribution means a green one appearing well below the going rate deserves the question of where it came from, asked plainly and without accusation.
High-Intensity Titanium resists the soft scuffing that plain titanium picks up, so unusually easy marking is worth a second look.

Area	What to check	What is correct	Red flag
dial	Seconds hand motion	A continuous glide with no step at any magnification	Any stepping, which means the glide wheel is not running as a Spring Drive should
dial	Green gradient and the embossed Ushio pattern	An even gradient with the tide pattern pressed into the dial and visible under angled light	A flat printed pattern, or a gradient that shifts abruptly rather than smoothly
case	Unidirectional bezel, 120 clicks	Anticlockwise only, 120 defined clicks, green fired through the ceramic insert	Bidirectional rotation or a pale substrate visible at a chipped edge
caseback	Papers against the distribution channel	Boutique or Master Shop paperwork consistent with how this reference is sold	Nothing wrong on its own, but worth asking about given the restricted channel

Common legitimate replacements

Bracelet links and the diver extension are ordinary service items.
The ceramic insert is replaced after damage.

Expert resources: Grand Seiko boutiques can confirm both the reference and its channel. See the SLGB023 entry in this catalog for the shared mechanical checks.