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Seiko A721-400B
The Seiko A721-400B watch movement incorporates a sweep seconds function.
The Seiko A721-400B features the following functions:
- Sweep Seconds
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
|---|
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.40 x 0.100 x 320 x 9.0 mm | GR3665 | 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
| Part Description | Reference # | Alternate | Buy |
|---|---|---|---|
| BALANCE COMPLETE | 721/760 | Buy part | |
| MAINSPRING 1.40-.10-320 9 | MS-511M | GR 3665 | Buy part |
| PALLET ARBOR 40X110X10 | 72S/93P | 714/AS 1430 | Buy part |
| ROLLER 180X75X36 | 82S/40R | 730/31 | Buy part |
| ROLLER, INCABLOC 180X75X36 | 82S/147R | 730/AS 1649 | Buy part |
| STAFF | 100/1599 | Buy part | |
| STAFF, INCA | 100/1809 | Buy part | |
| STEM, FEMALE | 360/256 (use 360/264) | 360/256 | Buy part |
| STEM, HUB 1.35 TAP 10 OVERSIZE | 200/52F | 401/AS 984 | Buy part |
| STEM, T10 | 200/1275F | 401/AS 1506 | Buy part |
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