Patek Philippe's Nautilus collection was launched in 1976. This collection is best known for its powerful design and dependability. The unparalleled design of these models is uniquely formed to imitate the universal shape of a porthole, which is found commonly in most maritime vessels. Simply stated, the timepieces in the Nautilus collection are sophisticated, timeless, and sporty. With the rounded octagonal shape of its bezel, the ingenious porthole construction of its case, and its horizontally embossed dial, the Nautilus has epitomized the elegant sports watch since 1976. Forty Years later, it comprises a splendid collection of models for men and women. This Nautilus 5712G-001 is presented in sporty but elegant 40mm 18k white gold case. Matte black alligator strap with fold-over clasp. Apart from displaying hours and minutes on its slate grey dial, it has a seconds sub-dial at 4 o’clock, a power-reserve indicator between 10 and 11 o'clock, and an analog date dial at 7 o’clock which has an integrated moon-phase display. Patek Philippe Calibre 240 PS IRM C LU Automatic movement, a power reserve of approximately 48 hours. Scratch resistant sapphire crystal. Fluted crown. Skeleton case back. Oval case shape, case size: 40 mm, thickness: 8.52mm. There is a pusher for the moon-phase on the side of the case. Nautilus models generally have a water resistance rating of 120 meters, but this model is only 60 metres, because of the moon-phase pusher. Functions: moon phase, date, hour, minute, small second, power reserve indicator.