Seiko 21 Movement Details

Seiko caliber 21 is a hand winding watch movement.
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Sub-brands: Sportslady
Day / date?No
GMT / world time?No
Chronograph?No
Rate:19,800 bph
Number of jewels:17
Size / diameter:17.8mm x 15.3mm
Height:3.5mm
Development division:Daini (Kameido, Tokyo, Japan)
PDF guides: Technical guide : 21A
Technical guide : 21C
Technical guide : 21D
Related movements: 2104 2118

Part Codes

Stem code: 351211
Balance wheel code: 310210
Mainspring code: 401210
Screw codes: 012102 (stud screw), 012107 (dial screw), 012121 (stud screw), 012210, 012214, 012254, 012303, 012502, 012604, 012707, 012807