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Seiko 4N21-0490
Ligne: 11 x 12.75'''
Jewels: 3
Frequency: 21600 vph
Period used: ~1975
Size: 24.65 x 28.7 mm
Height: 6.2 mm
The Seiko 4N21-0490 watch movement, which was in use around 1975, incorporates a pointed balance staff supported by white jewels. According to the manufacturer, a diode parallel to the inductor on the balance contributes to stabilizing the amplitude and enhancing durability by preventing sparks during contact. In terms of functionality, the movement features an electromechanically controlled balance motor, sweep second, and a date that can be set within a +/-24-hour range. Additionally, it includes dual time 12-hour functionality with a quickset option by reverse setting, and a hack feature.
The Seiko 4N21-0490 features the following functions:
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
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Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
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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
| Part Description | Reference # | Alternate | Buy |
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