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The ref. 3712 was the first truly complicated Nautilus and was only produced for one year!Almost 30 years after the introduction of the pioneering ref. 3711 Nautilus, Patek introduced the first truly complicated Nautilus as the ref. 3712 (of course, the Nautilus 3710 with power reserve indicator came out in 1998 already, but the mere addition of one complication doesn’t necessarily make a ‘complicated watch’). The ref. 3712 was produced only in 2005 and was replaced just a year later by the ref. 5712. This makes the 3712 among the rarest of all Nautilus variants and highly sought after.The 3712 adds a decentral second, a moonphase (and date function), and a power reserve indicator to the classic 40 mm ‘Jumbo’ Nautilus case. The three indicators are placed around the dial in a surprising manner, which gives the watch a quirky yet surprisingly harmonious appearance.The iconic Gerald Genta-designed octagonal case is executed in stainless steel and features the well-known integrated Nautilus bracelet. The watch sports a blue degradé dial with a horizontally embossed pattern. A see through sapphire caseback reveals an unobstructed view of Patek’s caliber 240 PS IRM C LU—with PS for petite seconde (small seconds), IRM for indication de réserve de marche (power reserve), C for calendrier (calendar), and LU for lune (moon). The movement is exquisitely finished and features a 21k yellow gold microrotor.The watch is in excellent condition and comes as a full set with the original box and papers.