Seiko Caliber Y621A Parts Catalogue and Technical Data
Technical data sheet and parts catalogue for the Seiko Caliber Y621A automatic winding watch movement. This service manual provides detailed exploded diagrams of all movement components with part numbers, extensive parts lists covering screws and jewels, and complete technical specifications including case diameter Ø27.4mm, height 4.95mm, 17 jewels, and 21,600 vibrations per hour. The movement incorporates three hands (hour, minute, second), automatic winding mechanism, date calendar, and instant calendar setting device. A practical lubrication guide specifies oil types and application quantities needed during assembly and maintenance work on this caliber.
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Document Details
- Format
- Pages
- 3
- Size
- 180.6 KB
- Category
- Watchmaking