Seiko 1421 Movement Details

Seiko caliber 1421 is an analog quartz watch movement produced from around 1980.
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Sub-brands: Fieldmaster, Exceline, Belfina, Socie, Laurier, Silverwave
Battery:SR621SW / 364 (Silver oxide)
Accuracy:±15 seconds/month
Day / date?No
GMT / world time?No
Chronograph?No
Hacking?Yes
Rate:32,768 Hz
Number of jewels:2
Size / diameter:15.1mm x 13.0mm
Height:2.8mm
Stem code: 351144
Screw codes: 012155 (dial screw), 012170, 012171
Development division:Daini (Kameido, Tokyo)
Notes:Has a battery life indicator function where the seconds hand moves in two-second intervals when the battery is running low. The same as cal. 1428 but with a central seconds hand instead of a small seconds sub-dial.
PDF guides: Technical guide for 1421A & 1428A
Parts list for 1421A
Related movements: 1400 1428