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 |