Seiko 603 Movement Details
Seiko caliber 603 is an automatic watch movement. Production started around 1960.
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|Day / date?||No|
|GMT / world time?||No|
|Number of jewels:||17, 20, 21 or 30|
|Size / diameter:||27.6mm|
|Notes:||Effectively the same as cal. 6201. Replaced by cal. 830.|