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Seiko 8420-7400
The Seiko 8420-7400 watch movement features an Adjustable Stud Holder for optimal precision adjustments. It incorporates Shock Protection to minimize the effects of external impacts on the movement. The movement operates at a beat rate of 21600 vph.
The Seiko 8420-7400 features the following functions:
- Adjustable Stud Holder
- Shock Protection
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
|---|
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.60 x 0.080 x 240 x 7.0 mm | GR4445 | Manual | Buy mainspring |
Incabloc Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
KIF Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
Documents
Parts Listing
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