Seiko 8305 Movement Details
Seiko caliber 8305 is an automatic watch movement. Production started around 1964.
| Sub-brands: | Sea Lion, Seikomatic-R |
| 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: | The same as cal. 8306 but without day display (date only). Unusually, the date is quickset in both directions. The automatic winding mechanism does not use Seiko's famous "magic lever" system – instead it has an integrated wheel system, making the movement slimmer. |
| Related movements: | 830 8306 8325 840 |
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