Valjoux 72-770, Mainspring
- Manufacturer: Prima no: 130U36
- Measures: 1,30 x 11.5 - 0.14 - 360
- Fits cal: 23, 23c, 72, 72c
Versions: 13'''
- 23: 30/45 min counter.
- 23c: 30/45 min counter, calendar.
- 72: 30 min, 12 hour counter.
- 72c: 30 min, 12 hour counter, day, date, month calendar.
- 88: 30 min, 12 hour counter, day, date, month calendar, moon phase.
- 90: sweep second, day, date, month calendar, moon phase.