The Ronda 031 watch movement is a hunter calibre movement used during the period of 1898-1932. It features a bimetallic screw balance with four adjustment screws and a Breguet hairspring. The movement includes a stem setting mechanism with a clutch wheel and rocker bar, which prevents the hands from moving when switching to the winding position. Additionally, it offers the functions of stem winding and setting, as well as a sub second function.