Certina 15.20-404, Winding stem, inner, female
- CERTINA original inner winding stem, not in factory packaging.
- Fits cal: 15.20, 15.21, 17.211, 17.221
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.
