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.