| Brand | Seiko |
| Caliber Number | 6308, 6308A |
| Base Caliber | Seiko 6309A |
| Movement Type | Automatic |
| Lignes | 12”’ |
| Diameter | 27mm |
| Height | 5.2mm thick |
| Jewels | 17 |
| Vibrations Per Hour | 21,600 bph |
| Power Reserve | 47 hours |
| Lift Angle | 54.5 degrees (needs confirmed) |
| Shock System | Diashock |
| Rotor | Ball bearing |
| Mainspring | 401615 |
| Balance Staff | 311601 |
| Hands | 1.5mm x 0.90mm x 0.20mm |
| Hacking? | No |
| Manual Winding? | No |
| Winding Direction | Bi-directional (Magic Lever) |
| Functions | Hours, minutes, central seconds, quickset date at 3:00 |
| Country of Manufacture | Japan |
| Known Models | 6308 (add more in the comments below…) |
The Seiko caliber 6308A is a vintage automatic workhorse movement from the 1980’s and as far back as 1976.
6308A VS 6309A:
The caliber 6308A is based on the Seiko caliber 6309A. The main difference between these two movements is that the 6309A has a day/date complication at 3:00, whereas the 6308A only has a date at 3:00.
Additional Resources:
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