The Femga 502 watch movement, manufactured from 1948 to 1954, features a Breguet hairspring and a special stem with gear for winding via the closing slide case. It also includes a barrel with a friction clutch. This movement offers manual wind functionality with a sub second display. Additionally, it incorporates several functions, such as day, date hand (adjustable via a pusher at 5 o'clock), month (adjustable with a pusher at 7 o'clock), and moon phase (settable with a pusher at 4 o'clock). Furthermore, the movement includes a calendar and a moon-phase display, with the pusher positions related to the crown at the 12 o'clock position. This movement variation is available in Calendermeto models.