GM12 Miyota Quartz Watch Movement is a 3 hand movement (hour/minute/second) with date @ the 3 o'clock position. Movement is a 10 1/2 ligne movement, 23.30 mm in diameter with a thickness of 2.71 mm, overall height 4.17 mm. Hand dimensions are 120/70/17 (h/m/s). 0 jewels, uses 364 battery. Use stem part number 065-543 (tap 0.90 mm / tap 10).

1M12 = GM12 

Movement Interchange
Bulova 6362.17
Citizen 3810, 6110, 6112
Miyota 0640, 3W10, 6M12, GM10