Seiko 4520 Movement Details
Seiko calibre 4520 is a high grade hand winding watch movement.
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| Sub-brands: | Grand Seiko |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Rate: | 36,000 bph |
| Number of jewels: | 25 |
| Size / diameter: | 27.0mm |
| Height: | 3.5mm |
| Development division: | Daini (Kameido, Tokyo, Japan) |
| Related movements: | 4500 4502 4522 4580 |
Part Codes
| Stem code: | 354452 |
| Balance wheel code: | 310451 |
| Mainspring code: | 401450 |
| Screw codes: | 012128 (stud screw), 012204, 012223, 012226, 012276, 012408, 012645, 012720 (dial screw), 012730 (case screw), 012735, 012741 |