The Jules Audemars Perpetual Calendar is the first Jules Audemars watch with a perpetual calendar, equation of times and an astronomical complication due to a mechanism barely 4 mm thick. The watch uses the automatic calibre 2120/2802 ultra thin self winding movement with a forty hour power reserve and is so precise it only needs to be updated once in March 2100. The Jules Audemars is available in either eighteen karat white or rose gold with an alligator strap.