With its new Ref. 5905P Annual Calendar Chronograph, Patek Philippe brings a reference to replace the 5960 precious metal references. The 5905 begins with a meanignfully upsized case (42mm vs. 40.5mm), still gracefully rounded with gently curved lugs — crafted of platinum. The dial — available in navy blue and black versions — reflects the design of the Ref. 5205 Annual Calendar launched in 2010 but with new colors and other details including now being a 60 minute chrono rather than 12 hour. All in all, I think it is much improved as the changes enable the subdial to be simpler and thus easier to read. to I’ll break it all down, below.