The Cyma Tavannes 030KB watch movement, manufactured between 1947 and 1954, incorporates the Breguet hairspring and features a Celestograf calendar module on the 470 counterpart. The specific differences between the 473 and 479 movements are unknown. Functionally, the Cyma Tavannes 030KB movement offers manual winding, a sweep second hand, day, date hand (set by a pusher at 4 o'clock), month (set by a pusher at 10 o'clock), and moon phase (set by a pusher at 8 o'clock). Additionally, the movement is available in both sweep seconds and non-sweep seconds variations and includes a calendar and moon-phase display.