Seiko 31 Movement Details
Seiko caliber 31 is an electronic watch movement produced from around 1968.
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Rate: | 21,600 bph |
| Development division: | Suwa (Nagano) |
Seiko caliber 31 is an electronic watch movement produced from around 1968.
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Rate: | 21,600 bph |
| Development division: | Suwa (Nagano) |