Seiko 4205 Movement Details

Seiko caliber 4205 is an automatic (with hand winding) watch movement. Production started around 1976.
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Power reserve:40 hours
Accuracy:+55/-35 seconds/day
Day / date?Date only
GMT / world time?No
Rate:21,600 bph
Number of jewels:17
Lift angle:49º in 4205A & 4205B, 52º in 4205C
Size / diameter:17.2mm
Development division:Daini (Kameido, Tokyo, Japan)
Notes:Used in ladies diving watches. The same as cal. 4206 but without day display (date only).
PDF guides: Technical guide : 4205A
Technical guide : 4205B, 4206B, 4207B, 4208B, 4225A & 4227A
Technical guide : 4205C, 4206C, 4207C, 4208C, 4225B & 4227B
Related movements: 4206 4207 4208

Part Codes

Stem code: 351420
Balance wheel code: 310421
Mainspring code: 201420


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