| Manufacture | Lémania | |
| Société | Alfred Lugrin | |
| Lieu | L'Orient | |
| Calibre | 5000 à 5800 | |
| Diamètre | 40.00 mm | |
| Hauteur | 7.40 mm | |
| Epoque | 1933 | |
| Alternances | 18'000 et 36'000 | |
Sport counter caliber from 5000 to 5800.
Also used by Omega under the caliber 180 and 181.
They appeared in Omega catalogues from 1933 onwards.