Grand Seiko
Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB023
The Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver (reference SLGB023) is a 40.8 mm High-intensity titanium watch with a blue dial. It runs on the spring Drive caliber 9RB1 with a 72-hour power reserve and is water resistant to 300 m. It was introduced in 2026 and is still in production.
Specifications
Case
- Reference
- SLGB023
- Collection
- Evolution 9
- Case size
- 40.8 mm
- Thickness
- 12.9 mm
- Case material
- High-intensity titanium
- Case shape
- Round
- Crystal
- Sapphire, inner AR coating
- Water resistance
- 300 m
- Bracelet / strap
- High-intensity titanium
Dial and bezel
- Dial
- Blue
- Bezel
- Unidirectional 120-click, ceramic insert
Movement
- Movement
- Spring Drive
- Caliber
- 9RB1
- Power reserve
- 72 hours
- Jewels
- 33
- Functions
- Seconds, Power reserve indicator
Production
- Production
- 2026 – today (current)
Dial versions
This reference was made with these dials and finishes.
SLGB023 Blue
Ushio gradient
How it compares within the Evolution 9 family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| SLGB023 (This watch) | 40.8 mm | High-intensity titanium | Blue | 9RB1 | 2026– |
| SLGB007 | 40 mm | Titanium | Black | 9RB2 | 2026– |
| SLGB009 | 40 mm | Ever-Brilliant Steel | White | 9RB2 | 2026– |
| SLGB011 | 40 mm | Ever-Brilliant Steel | Blue-green | 9RB2 | 2026– |
| SLGB013 | 40 mm | Ever-Brilliant Steel | Blue | 9RB2 | 2026– |
| SLGB015 | 37 mm | Ever-Brilliant Steel | Blue | 9RB2 | 2026– |
| SLGB025 | 40.8 mm | High-intensity titanium | Green | 9RB1 | 2026– |
| SLGC015 | 43 mm | Brilliant Hard Titanium | Blue | 9SC5 | 2026– |
| SLGH029 | 40 mm | Titanium | Black | 9SA5 | 2026– |
About the Evolution 9 family
Evolution 9 is the design language Grand Seiko introduced in 2020, alongside the high-beat caliber 9SA5, as a modern development of the Grand Seiko Style: a thinner bezel, wider hour and minute hands and a lower, more comfortable case. It became a collection in its own right and now covers mechanical, Spring Drive and chronograph models.
The catalog includes references with the 9SA4 and 9SA5 mechanical calibers, the 9RA2 and 9RA5 Spring Drive calibers and the 9RB family, in steel, Ever-Brilliant Steel, high-intensity titanium and platinum. Nature-themed dials such as the white birch texture are a large part of their appeal.
Quick answers
- What size is the Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB023?
- The Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB023 has a 40.8 mm case, 12.9 mm thick.
- What movement does the Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB023 use?
- It uses the spring drive caliber 9RB1, with a 72-hour power reserve.
- How water resistant is the Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB023?
- It is water resistant to 300 metres.
- Is the Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB023 still in production?
- Yes, it is a current reference.
- When did the Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB023 come out?
- It was introduced in 2026.
- What is the Grand Seiko Grand Seiko Evolution 9 Spring Drive U.F.A. Ushio 300 Diver SLGB023 made of?
- The case is High-intensity titanium. Bracelet or strap: High-intensity titanium.
Catalog facts checked November 2026.