The Patek Philippe Annual Calendar Chronograph, Ref. 5960 was originally introduced in 2006 in a platinum case. There are few steel Patek Philippe watches and this model is therefore a collector’s piece. The movement, automatic Caliber CH 28-520 IRM QA 24H, is unchanged, but the dial has been refurbished and the bracelet, also steel, is new for the brand. The first day of the month is displayed in red and the rest in black. There is also a power reserve indicator and day/night indications.