Grand Seiko
Calibre 9R31
Spring Drive, manual winding
Specifications
- Maker
- Grand Seiko
- Type
- Spring Drive, manual winding
- In-house
- Yes
- Power reserve
- about 72 h
- Frequency
- Not found in sources
Sources
- Official Grand Seiko retrieved October 14, 2026
Used in
| Watch | Ø | Thickness | Lug-to-lug |
|---|---|---|---|
| Grand Seiko Elegance SBGY007 “Omiwatari” SBGY007G | 38.5 mm | 10.2 mm | 43.7 mm |