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Seiko 4N21-004S
The Seiko 4N21-004S watch movement is an automatic mechanical movement with a sweep seconds hand and a calendar function. It has a beat rate of 21600 vibrations per hour (vph) and is equipped with 25 jewels.
The Seiko 4N21-004S features the following functions:
- Automatic Winding
- Calendar
- Sweep Seconds
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
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Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
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| 1.10 x 0.120 x 320 x 9.5 mm | GR2652 | 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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Parts Listing
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