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Seiko 8420-6640
The Seiko 8420-6640 watch movement is an automatic mechanical movement that incorporates a day and date display function. It also features a sweep seconds hand and a calendar function.
The Seiko 8420-6640 features the following functions:
- Automatic Winding
- Calendar
- Day and Date Display
- Sweep Seconds
Balance Staff Listing
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Mainspring Listing
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Incabloc Part Listing
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KIF Part Listing
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Parts Listing
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