Seiko 2B21 Movement Details

Seiko caliber 2B21 is an analog quartz watch movement. Production was in the 1980s.
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Sub-brands: Seiko 5
Battery:SR521SW / 379 (Silver oxide)
Accuracy:±20 seconds/month
Day / date?No
GMT / world time?No
Number of jewels:1
Size / diameter:15.1mm
Development division:Daini (Kameido, Tokyo, Japan)
Notes:Used in ladies watches.
PDF guides: Technical guide : 2B21A
Related movements: 2B20 2B31

Part Codes

Stem code: 354235
Screw codes: 012010, 012024, 012495, 012818, 012819