Seiko 4005 Movement Details
Seiko caliber 4005 is an automatic watch movement. Production started around 1968 and production finished in 1969.
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| Sub-brands: | Bell-matic |
| Day / date? | Date only |
| GMT / world time? | No |
| Chronograph? | No |
| Alarm? | Yes |
| Hacking? | No |
| Rate: | 19,800 bph |
| Number of jewels: | 27 |
| Lift angle: | 52º |
| Notes: | The same as cal. 4006 but with date display only (no day). It has a 10-second mechanical alarm feature powered by a second mainspring. The lift angle is often listed as 58.4º but research by Martin at "Adventures in Amateur Watch Fettling" shows that the lift angle is 52º. |
| Related movements: | 4006 |
Part Codes
| Stem code: | 354805 |
| Balance wheel code: | 310470 |
| Mainspring code: | 401805 |