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Return To ShopThe Seiko 8420-7690 watch movement incorporates an adjustable stud holder feature, allowing for precise adjustment of the hairspring's length. The movement also includes shock protection, which ensures the watch's stability and accuracy even under external impacts.
The Seiko 8420-7690 features the following functions:
Dimensions | GR Reference # | End Type | Buy |
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1.30 x 0.070 x 220 x 6.0 mm | GR3186 | Manual | Buy mainspring |
Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) | |
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