Seiko 2M21 Movement Details
Seiko caliber 2M21 is an analog quartz watch movement. Production started around 1988.
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| Sub-brands: | Harmony |
| Battery: | SR920W / 370 (Silver oxide) |
| Accuracy: | ±15 seconds/month |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Hacking? | Yes |
| Rate: | 32,768 Hz |
| Size / diameter: | 28.0mm x 23.0mm |
| Height: | 2.5mm |
| Development division: | Daini (Kameido, Tokyo, Japan) |
| PDF guides: | Battery replacement guide |