Grand Seiko Spring Drive U.F.A. Ushio 300 Diver 40.8mm

Reference: SLGB023 (2026) | Blue dial on a titanium bracelet

Case diam.

40.8 mm

Lug to lug

48.5 mm

Height

12.9 mm

Est. min. wrist size

6.7 in / 16.9 cm

Quick tags:

Dive Blue dial Dive bezel Rotating bezel Screw-down crown Unidirectional bezel Power reserve indicator

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Specifications

Base

Brand

Grand Seiko

Collection

Evolution 9

Watch style

Dive

Year launched

2026

Build

Case shape

Tonneau

Case diameter

40.8 mm

Case height

12.9 mm

Lug to lug

48.5 mm

Lug width

21 mm

Weight

122 g

Water resistance

300 m

Case materials

Titanium

Bracelet materials

Titanium

Visuals

Dial color

Blue

Case color

Silver, Blue

Band color

Silver

Movement

Caliber

Grand Seiko 9RB1

Type

Automatic

Power reserve

72 hours

No. of jewels

Complications

Power reserve indicator

Other watch features

Dive bezel

Rotating bezel

Screw-down crown

Unidirectional bezel

Chronoshots

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Wrist size and fit

Based on estimates this watch fits best on wrists sized between 6.7in - 7.7in (16.9cm - 19.6cm) .

5 12.7

5.5 13.9

6 15.2

6.5 16.5

7 17.7

7.5 19

8 20.3

8.5 21.5

9 22.8

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Grand Seiko Spring Drive U.F.A. Ushio 300 Diver 40.8mm

Specifications

Base

Build

Visuals

Movement

Other watch features

Chronoshots

Videos

Wrist size and fit

Where to buy

Reviews

Top contributors

Reviews