This Patek Philippe Annual Calendar Chronograph reference 5960/1A-010 is the steel version of one of the brand's most recognizable modern complications. Its self-winding movement combines a chronograph with an annual calendar, the pairing that made the 5960 a distinct proposition within Patek's contemporary output. In this reference the chronograph display is concentrated into a single monocounter, a layout that gives the watch a more direct, instrumental character than the maison's more classical calendar pieces. For a collector who prefers complicated Patek Philippe watches with a sharper edge, that is much of the appeal. The stainless steel case measures 40.5mm across and 13.5mm thick, a size that gives the watch real authority without pushing it out of proportion. Against that case, the black dial underscores the reference's more modern stance. It remains a watch that showed Patek Philippe could treat high complication with a more contemporary, almost sporting emphasis without giving up its own design language.