Seiko 5646 movement
Seiko caliber 5646 is a high grade automatic watch movement produced from around 1970.
| Sub-brands: | Grand Seiko |
| GMT/world time? | No |
| Chronograph? | No |
| Hacking? | Yes |
| Rate: | 28,800 bph |
| Number of jewels: | 25 |
| Lift angle: | 56° |
| Development division: | Suwa (Nagano) |
| Related movements: | 5641 5645 |