Certina 17.02-770, Mainspring
Tax included.
- CERTINA/ETA original mainspring in factory packaging.
- Fits cal: 17.02, 17.021
Versions with ETA base caliber:
- 17.011: (ETA 2671) 28.800 A/h, automatic wind, sweep second, date.
- 17.02: (ETA 2660) 28.800 A/h, manual wind, sweep second.
- 17.021: (ETA 2661) 28.800 A/h, manual wind, sweep second, date.