Seiko Cal. 4M21A Supplement Vol. 2 - Power Resource & Parts
Seiko Cal. 4M21A Supplement Vol. 2 is a technical parts catalogue detailing power supply modifications to this quartz movement. The document covers the transition from original capacitor units to the new rechargeable battery unit (3027 29R), including comparative performance data and detailed parts specifications with visual diagrams. The parts list identifies original capacitor units (3029 114, 3029 116), the capacitor/battery clamp assembly (4225 552), and the replacement rechargeable battery unit complete with discrimination markings for proper identification.
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Document Details
- Format
- Pages
- 2
- Size
- 65.0 KB
- Category
- Watchmaking