Seiko 4420 Movement Details
Seiko caliber 4420 is a high grade hand winding watch movement produced from around 1964.
| Sub-brands: | Grand Seiko, King Seiko |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Rate: | 18,000 bph |
| Number of jewels: | 27 |
| Size / diameter: | 25.6mm |
| Height: | 4mm |
| Stem code: | 354447 |
| Balance wheel code: | 310490 |
| Mainspring code: | 401680 |
| Development division: | Daini (Kameido, Tokyo) |
Articles
- Parallel Universe: The King Seiko 4420-9990 Chronometer [adventuresinamateurwatchfettling.com]
- Grand Seiko Collector’s Guide [thespringbar.com]