Automatic movement ETA 7751, chronograph mechanism with cams, 2 printers, automatic winding with ball bearing, hours, minutes, small seconds, stop-second device, back system ETACHRON and back corrector, 28. 800 vibrations per hour; 4 Hz, chronograph 60 seconds, 30 minutes and 12 hours counter, date indication by hands, days, month and moon phases visible through dial window, quick correction of date, day, month and moon phases, 24 hours hand, 25 jewels, chronograph mechanism with cams, 2 printers, automatic winding with ball bearing, hours, minutes, small seconds, stop-seconds device, back system ETACHRON and back corrector, 28. 800 vibrations per hour; 4 Hz, chronograph 60 seconds, 30 minutes and 12 hours counter, date indication by hands, days, month and moon phases visible through dial window, quick correction of date, day, month and moon phases, 24 hours hand, 25 jewels.