Patek Philippe Grand Complications Perpetual Calendar Chronograph 41mm Platinum Blue Lacquered Dial (Ref# 5270P-016)

41 mm platinum case, 12.4 mm thick, entirely polished with a concave bezel and two-tier lugs, a single diamond set at 6 o'clock, and a sapphire-crystal case back. Lacquered blue dial with a black-gradient rim, white gold applied faceted "obus"-style hour markers, white gold faceted dauphine-style hands, and a tachymeter scale printed in white. Manually wound caliber CH 29-535 PS Q, 32 mm in diameter and 7 mm thick, with 456 parts and 33 jewels, beating at 28,800 vph (4 Hz) with a Breguet balance spring. Functions: perpetual calendar chronograph with central chronograph hand and instantaneous 30-minute counter; day and month in a double aperture at 12 o'clock, day/night and leap-year indications in round apertures, date by hand at 6 o'clock, moon phases, and small seconds. Power reserve of approximately 55 to 65 hours with the chronograph disengaged. Black composite strap with a fabric pattern and contrasting blue stitching, platinum fold-over clasp. Water resistant to 30 metres (100 feet). Patek Philippe Seal certified.