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Seiko 8420-5040
The Seiko 8420-5040 watch movement is equipped with either 17 or 23 jewels, which help reduce friction and improve the accuracy and longevity of the mechanism.
The Seiko 8420-5040 features the following functions:
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.40 x 0.080 x 320 x 7.5 mm | GR3611 | 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
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