Seiko 2M21 Movement Details

Seiko caliber 2M21 is an analog quartz watch movement produced from around 1988.

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
PDF guides: Battery reset guide