The Patek Philippe Perpetual Calendar Chronograph Ref. 5270 was originally launched at Baselworld 2011 as a new complicated wristwatch with a rich 70-year heritage of tradition and innovation. This year at Baselworld 2015, Patek presented a new iteration of the ref. 5270 in 18K rose gold. Unfortunately, this exceptional timepiece didn't get as much attention as the new Patek Philippe Calatrava Pilot Travel Time ref. 5524G-001 featured here. Nevertheless, the new Patek Philippe ref. 5270R-001 is without a doubt the quintessential Perpetual Calendar Chronograph —in a perfectly sized case measuring 41 mm in diameter— and one of the most coveted references among Patekaholics. The Patek Philippe ref. 5270 available up until now only in 18K white gold —or platinum with diamonds under reference 5271—, combines the functionality of a perpetual calendar with the new classic chronograph caliber that is crafted entirely in-house.