IWC Portuguese Perpetual Calendar, Series IW503502, King of Portugal, features a

IWC Portuguese Perpetual Calendar, Series IW503502, King of Portugal, features a double-sided anti-reflective sapphire crystal with arched edges and a night-blue dial. The annual calendar displays a simple and sleek design, with three separate semicircular windows displaying the month, date, and day of the week, positioned between 11 and 1 o'clock. A small three-hand design, power reserve indicator at 3 o'clock, and small seconds at 9 o'clock, are featured. The watch also features a track-style minute track and Arabic numerals for the hours. The neat layout makes reading the time and date very easy.