Since the 1920s Patek Philippe watches have been renowned for their superior quality, endowed with additional functions. In 1015, Patek introduced this elegant Annual Calendar Chronograph, combining two of the most sought-after complications on the market today. The annual calendar, which only needs to be adjusted once a year at the end of February, is ingeniously displayed via three apertures on the top part of the dial, while the central chronograph hand captures elapsed times against the crisply graduated minute scale. Housed in a sumptuous 42mm platinum case, the navy blue dial lends these men's watches a character of impeccable distinction. Visible through the display back is Patek Philippe's precision automatic movement with a gold rotor swinging across the lavishly decorated bridges. Ref. 5905 with a blue dial is presented on a matching navy blue strap.