Certina 13.20-404, Winding stem, inner, female
- CERTINA original inner winding stem without factory packaging.
- Fits cal: 13-20, 13-21, 13-22
Versions:
- 13-20: N: = 19.800, no mountings.
- 13-21: N: = 19.800, mounting threads.
- 13-22: N: = 21.600, mounting threads.
