Seiko 5641 Movement Details
Seiko calibre 5641 is a high grade automatic watch movement. Production was in the 1970s.
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| Sub-brands: | Grand Seiko |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Hacking? | Yes |
| Rate: | 28,800 bph |
| Number of jewels: | 25 |
| Lift angle: | 56º |
| Size / diameter: | 25.6mm |
| Height: | 4.5mm |
| Development division: | Suwa (Nagano Prefecture, Japan) |
| Notes: | The same as cal. 5645 and cal. 5646 but without date or day display. |
| Related movements: | 5645 5646 |
Part Codes
| Stem code: | 354560 |
| Balance wheel code: | 310561 |
| Mainspring code: | 401565 |
| Screw codes: | 022150 (stud screw), 022252, 022257, 022373, 022454, 022457, 022458 (screw for oscillating weight), 022467, 022484, 022486, 022662, 022667, 022753, 022761 (dial screw) |