TISSOT cal: 28.1 - 31.21

The first Automatic movement from Tissot was introduced in 1943 with the cal: 28* and the 28.1 which was abondoned already in 1944 as the cal: 28.5.1 and the similar 31.1 with larger plate was introduced.

*Note, we have no official documetation at all covering the cal: 28, just the pictured movement.

Versions:

  • 28:              1943?            sub second
  • 28.1:           1943 - 1944, sub second.
  • 28.21:         1943 - 1944, sweep second.
  • 28.5.1:        1944 - 1953, sub second, plate with mounting flange.
  • 28.5.21:      1944 - 1953, sweep second, plate with mounting flange.
  • 28.5N.21:    1951 - 1960, sweep second, second time zone, Navigator.
  • 31.1:           1944 - 1953, sub second, bigger plate.
  • 31.21:         1944 - 1953, sweep second, bigger plate.