Seiko 840 Movement Details
Seiko caliber 840 is an automatic watch movement. Production started around 1964.
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|Day / date?||Date only|
|GMT / world time?||No|
|Number of jewels:||30|
|Size / diameter:||28.6mm|
|Development division:||Suwa (Nagano)|
|Notes:||Replaced cal. 830. This movement became cal. 8305.|
|Related movements:||394 830 8305 8306|