CERTINA cal: 15.20 - 17.221
Technical data: Certina 15-20
- 32 jewels (oscillating weight with ruby ball bearing), automatic wind.
- S: = 6.75 15.30 mm.
- H: = 4.70 mm.
- N: = 19.800 A/h.
- Power reserve: --
Versions: Certina
- 15-20: 6.75''' 19.800 A/h.
- 15-21: 6.75''' 21.600 A/h.
- 17-211: 7.75''' 21.600 A/h.
- 17-221: 7.75''' 21.600A/h, date, new balance.
Versions: Longines
- 470: = Certina 15-20.
- 472: = Certina 15-21.
