Paying tribute to an iconic Grande Complication, Patek Philippe has created a jewelry version of its chronograph with perpetual calendar Reference 5271, enhanced by 80 blue baguette-cut sapphires (5.16 cts). The aesthetic harmony is complemented by the lacquered blue dial with black-gradient rim and the shiny black alligator strap with contrasting blue stitching. The CH 29-535 PS Q caliber is distinguished by its traditional architecture (manually wound, column wheel, toothed-wheel horizontal clutch), combined with six patented innovations in the chronograph, as well as its exceptionally slim calendar mechanism. Manually wound mechanical movement. Caliber CH 29‑535 PS Q. Chronograph. Central chronograph hand. Instantaneous 30-minute counter. Perpetual Calendar. Day, month, leap year and day/night indication in apertures. Date by hand. Moon phases. Small seconds. Platinum. Interchangeable full back and sapphire crystal case back. Water-resistant to 30 m. Diameter: 41 mm. Height: 12.7 mm.