The Patek Philippe Perpetual Calendar Chronograph ref. 5271 is among the most rare of modern Patek perpetual calendars. The 5271, the jeweled version of the 5270, features the in-house caliber 29-535 which repelaced the Lemania movemeent in the 5970. This watch features 38 baguette sapphires in the bezel, 20 baguette sapphires in the lugs, and 22 in the deployant clasp. This watch is truly one of the most rare and beautiful modern Patek Philippe Grand Complications on the market.