The Rayville 42 watch movement is an open face calibre with a bimetallic screw balance and a Breguet hairspring. It features a moustache lever and a wolf teeth winding gear. The movement also includes a flying barrel with Geneva stopwork. The functions of the Rayville 42 movement include stem winding and lever setting, as well as a sub-second function. This movement was commonly used during the period around 1910.