The Minerva 1 watch movement exhibits various bridge shapes, although specific differences between various calibres such as 1, 10.5''', 2, 10.5''', 30, 31, 50, 65 old, 66 old, 70 old, 71 old, 73 old, 76 old, 78, 90, 91, 107, 108, 110, and 112 are unknown. It is worth noting that the same designation is utilized for a new calibre. This particular movement performs manual winding, includes a sub-second function, and possesses a sweep seconds feature. It was predominantly utilized around the 1940s.