The Fleurier 43B watch movement, used from 1894 to 1926, features a hunter calibre design. It incorporates a bimetallic screw balance with four adjustment screws and a Breguet hairspring. The stem setting mechanism includes a clutch wheel and rocker bar, effectively preventing any movement of the hands while switching to the winding position. Additionally, the movement offers functions such as stem winding and setting, as well as a sub-second display.