Seiko 840 Movement Details
Seiko calibre 840 is an automatic watch movement. Production started around 1964.
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Day / date? | Date only |
GMT / world time? | No |
Chronograph? | No |
Rate: | 18,000 bph |
Number of jewels: | 30 |
Size / diameter: | 28.6mm |
Height: | 4.55mm |
Development division: | Suwa (Nagano Prefecture, Japan) |
Notes: | Replaced cal. 830. This movement became cal. 8305. |
Related movements: | 394 830 8305 8306 |