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Seiko 4M21-0A90
The Seiko 4M21-0A90 watch movement features an offset center wheel and operates at a beat rate of 21600 vibrations per hour (vph).
The Seiko 4M21-0A90 features the following functions:
- Offset Center Wheel
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
|---|
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.40 x 0.070 x 220 x 6.0 mm | GR3576 | Manual | Buy mainspring |
| 1.30 x 0.090 x 220 x 7.0 mm | GR3217 | 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) |
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Documents
Parts Listing
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