Seiko 4420 Movement Details
Seiko calibre 4420 is a high grade hand winding watch movement. Production started around 1964.
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| Sub-brands: | Grand Seiko, King Seiko |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Hacking? | Yes |
| Rate: | 18,000 bph |
| Number of jewels: | 27 |
| Size / diameter: | 25.6mm |
| Height: | 4mm |
| Development division: | Daini (Kameido, Tokyo, Japan) |
Part Codes
| Stem code: | 354447 |
| Balance wheel code: | 310490 |
| Mainspring code: | 401680 |
| Screw codes: | 012122 (stud screw), 012208, 012211 (dial screw), 012222, 012223, 012226, 012237, 012407 (case screw), 012408, 012547, 012614, 012645, 012707 |