Certina 13.20-420, 423, Crown wheel & core
- CERTINA original parts in factory sealed 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.
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