As the appeal for Patek Philippe perpetual chronographs is exceptionally strong, this watch further impresses. Upon its introduction at the Basel Fair in April 2011 it was the firm's first perpetual calendar chronograph to use a 100% in-house designed and manufactured movement. This model houses the celebrated caliber 29-535 PS with Patek Philippe's modern hallmark of excellence, the PP Seal.

The 5270 was introduced with dial variants. The first, now discontinued, has a railroad outer seconds track, larger Patek Philippe signature, and black oxidized gold baton numerals. The second variation was introduced in late 2013 with both a silver as well as blue dial, such as the present watch. Perhaps the most distinguishing feature of these dials is the dip in the outer seconds track at 6 o'clock. Often referred to as a 'chin dial,' this feature is characteristic of only this second generation 5270. In addition, the dial features legible circular apertures for day/night as wall as leap year indication, two windows for day and month, all housed within a large and attractive 41mm case. The present timepiece with white 'chin' dial has never before been offered at Christie's.

A successor to the 5970, this model represents the latest in Patek Philippe's perpetual chronograph evolution. One can say that due to the acclaimed all in-house caliber and distinguished dial that it is a true icon of modern Patek Philippe production.