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Seiko 5S21-7A20
The Seiko 5S21-7A20 watch movement features shock protection for enhanced durability. It operates at a beat rate of 18,000 vibrations per hour (vph) for accurate timekeeping. The movement incorporates 7 jewels for reduced friction and improved performance.
The Seiko 5S21-7A20 features the following functions:
- Shock Protection
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
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Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
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Incabloc Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
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KIF Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
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Documents
Parts Listing
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