The Fontainemelon 9344 watch movement was produced from 1937 to 1970, with over 3.5 million units manufactured during this period. It featured a manual-wind chronograph mechanism with a 60-second counter and 30/45-minute totalizer, which was cam switched. Other functions included a sub-second display, a tag with a pusher located at 10 o'clock, a date hand activated by a pusher at 9 o'clock, a month display with a pusher at 2:30 o'clock, and a moon-phase display controlled by a pusher at 8 o'clock. The movement was notable for its interchangeable parts, sometimes leading to series being produced with components from different calibres.