Grand Seiko
Calibre 9RB1
Spring Drive, self-winding
Specifications
- Maker
- Grand Seiko
- Type
- Spring Drive, self-winding
- In-house
- Yes
- Power reserve
- about 72 h
- Frequency
- Not found in sources
Sources
- Official Grand Seiko retrieved October 16, 2026
Used in
| Watch | Ø | Thickness | Lug-to-lug |
|---|---|---|---|
| Grand Seiko Evolution 9 SLGB023 “Ushio 300” SLGB023G | 40.8 mm | 12.9 mm | 48.5 mm |