Nautilus 5990/1A-011The Ref. 5990 1A 011 Nautilus Travel Time chronograph is one of Patek Philippes rare steel watches. It features a new blue dial with a ray sunburst dial and a delicate black gradation to the periphery. The self winding caliber CH 28 520 C FUS movement combines three convenient and user friendly complications: a flyback chronograph, a Travel Time function (two time zones with two separate hour hands; the skeletonized hand shows home time) and an ana