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Description
- CERTINA original winding stem, not in factory packaging.
- Fits cal: 15.20, 15.21, 17.211, 17.221
- Thread: 0.90 mm.
Versions:
- 15.20: 6.75''' 19.800 A/h.
- 15.21: 6.75''' 21.600 A/h.
- 17.211: 7.75''' 21.600 A/h, date.
- 17.221: 7.75''' 21.600 A/h, date, modified balance.
