Patek Philippe Nautilus 5726A-010. The Nautilus was introduced in 1976, designed by legendary designer Gerald Genta and has become one of Pateks most iconic models, the 5726 Annual Calendar is one of the latest Nautilus models to be produced, as expected has been very well received. Water resistant to 120 metres. Case diameter 40.5mm. Patek Philippe 324 S QA LU 24H self winding movement, 28,800vph, 34 jewels, 347 parts and a power reserve of 35 – 45 hours. Functions: Hours, Minutes, Centre Seconds, Moonphase, Day, Date, Month. White dial with index hour markers. Calendar: Day and month via apertures at 12, Moonphase and Date at 6. Steel Bracelet. See through sapphire case back. Box and papers dated January 2019.