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Seiko 1F20-5B30
The Seiko 1F20-5B30 watch movement features a sweep seconds function, providing a smooth continuous motion of the seconds hand. It is equipped with either 17 or 19 jewels, which serve to reduce friction and extend the longevity of the movement.
The Seiko 1F20-5B30 features the following functions:
- Sweep Seconds
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
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Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.35 x 0.135 x 380 x 12.0 mm | GR3520 | Manual | Buy mainspring |
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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