The Felsa 4017 watch movement, used from 1884 to 1894, is a hunter calibre movement featuring a bimetallic screw balance and a Breguet hairspring. It utilizes a ratchet between plates and a crown mechanism with a rocker bar. In higher-grade variants, it employs an excenter regulator and a balance with four adjustment screws. The movement functions include stem winding and lever setting as well as a sub-second feature.