Patek Philippe watch from Nautilus Power Reserve collection. The Patek Philippe Nautilus Power Reserve Moonphase classic premium quality 40mm 5712/1A-001 watches feature a reliable automatic self-winding mechanism (powered by the arm motion amplitude) of the PP240 calibre, which features: hour, minute and second hands, as well as date, moon phase, backup. The octagonal case of a 40 mm watch with a 9.5 mm height perfectly complements the image and beautifies the wrist of its wearer. For the production of Patek Philippe Nautilus Power Reserve Moonphase 40mm 5712/1A-001 watches offered in our online store, use high quality stainless steel 904L (Swiss standard), as well as high strength sapphire glass, thus providing maximum protection against chipping and mechanical damage. The distinctive feature of this model is the blue dial, whose hour indices provide hour markers. The Patek Philippe stainless steel bracelet completes the look with its signature folding clasp. The waterproofness of this model is 30M (WR30) – minimal exposure with water is allowed.