Certina 19-30-770, Mainspring
- CERTINA original mainspring in factory sealed packaging.
- Fits cal: 19-30, 19-31, 19-35, 19-351
Versions: 18.000 A/h.
- 19-25: manual wind, sweep second.
- 19-251: manual wind, sweep second, date.
- 19-26: manual wind, sweep second, modified barrel.
- 19-30: manual wind, sub second.
- 19-31: manual wind, sub second, plate without mounting flanges.
Versions: 19.800 A/h.
- 19-35: manual wind, sweep second.
- 19-351: manual wind, sweep second, date.
- 19-36: manual wind, sweep second, modified barrel.