The Fontainemelon 745-4N is a mechanical watch movement that falls under the open face calibre category. The specific differences between the Reconvilier 26 and Fontainemelon 745-4N movements are not known. The Fontainemelon 745-4N movement is equipped with several functions which include stem winding and setting, as well as a sub-second display. This movement was commonly utilized in watches during the approximate period of 1930.