Thank you 52watch.com !
The Ultra Superautomatic was produced starting in 1949
Hallmarks were used by clockmakers to assert the authenticity of the time pieces they produced. Ultra was in its time, one of the well recognized hallmarks in French Clockmaking
A few beautiful vintage Ultra models:
Ultra 602 manual wind, 1954
Ultra Flatmaster, ultra thin movement, 1957
Ultra 41, made to order for the "Mines de la Sarre" administration comity, 1952
Auto-calendrier, automatic diving watch, 1963