Patek Philippe Perpetual Calendar Chronograph 5271P Emerald 5271/13P-001

The 5271 shares its 41 mm case size with the 5270, Patek's current perpetual calendar chronograph. The diamond-set 5271P-010 runs on the hand-wound calibre CH 29-535 PS Q, a 456-part movement combining a chronograph with an instantaneous 30-minute counter, a perpetual calendar with day, month, leap year and day/night in apertures, moon phases and small seconds. On that version, 58 baguette-cut diamonds cover the bezel and lugs, with another baguette as the 12 o'clock marker.

The Emerald sits beside the Sapphire (5271/11P-001) and the Ruby (5271/12P-001), which share its platinum case, size and black dial. The 5270 comes in gold or platinum with a plain bezel, among them the platinum 5270P-001 with a salmon dial and the 5270P-014 with a green one.