The Felsa 80 watch movement is a manual wind movement with sub-second function. It is part of a series of movements with various bridge shapes and the same designation for newer calibres. There are several other calibres in this series, 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. These differences between the calibres are not specified. The Felsa 80 movement was generally used around the period of 1940.