Grand Seiko
Calibre 9R66
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 14, 2026
- Official Grand Seiko retrieved October 14, 2026
Used in
| Watch | Ø | Thickness | Lug-to-lug |
|---|---|---|---|
| Grand Seiko Sport SBGE257 Spring Drive GMT SBGE257G | 40.5 mm | 14.7 mm | 48.7 mm |
| Grand Seiko Sport SBGE277 Spring Drive GMT SBGE277G | 44 mm | 14.7 mm | 50.8 mm |