Seiko 3870 Movement Details
Seiko caliber 3870 is an analog quartz watch movement. Production was in the 1970s.
| Battery: | SR44SW / 303 (Silver oxide) |
| Accuracy: | ±10 seconds/month |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Rate: | 16,384 Hz |
| Development division: | Suwa (Nagano Prefecture, Japan) |
| Notes: | Used in pocket watches. |