The perpetual calendar ranks among the classic complications in IWC’s Portugieser family. In the anniversary year, the manufacture presents it in a special interpretation. The Portugieser Perpetual Calendar Edition “150 Years” is available in a limited edition of 250 watches, featuring an 18-carat red gold case, a white dial with a lacquered finish, and blued hands. The IWC-manufactured 52616 calibre has an automatic Pellaton winding system; with its solid gold rotor and two barrels, it builds up a power reserve of 7 days. The perpetual calendar automatically recognises the different month lengths and the leap years, and needs no manual adjustment until 2100. The double moon phase display shows the moon phase for the northern and southern hemisphere, and will deviate from the actual course of the moon by just one day every 577.5 years.