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]