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
Rate:18,000 bph
Number of jewels:30
Size / diameter:28.6mm
Development division:Suwa (Nagano Prefecture, Japan)
Notes:Replaced cal. 830. This movement became cal. 8305.
Related movements: 394 830 8305 8306


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