Certina 17.36, Mainspring, no: 770
- CERTINA original part in factory sealed packaging.
- Fits cal. 17.36, 17.361
Versions, New generation:
- 17-35: 21.600 A/h, automatic wind, sweep second.
- 17-351: 21.600 A/h, automatic wind, sweep second, date.
- 17-36: 21.600 A/h, manual wind, sweep second.
- 17-361: 21.600 A/h, manual wind, sweep second, date.