Dispositif d'actionnement de la sonnerie dans les montres à répétition
April 12, 1905
CH31328A was originally granted on March 31, 1905. This was prior to the acquisition of Magnenat-LeCoultre & Cie by Excelsior Park in 1911.
CH31328/543E
An addendum to CH31328 was published on April 12, 1905 as 31328/543E
