TISSOT cal: 28.5-1 - 31-21
Versions:
- 28-1: sub second.
- 28-21: sweep second.
- 28,5-1: sub second, plate with mounting flange.
- 28,5-21: sweep second, plate with mounting flange.
- 28,5 N-21: sweep second, second time zone, Navigator.
- 31-1: sub second, bigger plate.
- 31-21: sweep second, bigger plate.