In 2015, IWC celebrated the 75th anniversary of the Portugieser (also known as Portuguese) by revamping almost the entire collection. This included new models, complications, and updates to existing pieces. The 2015 Portugieser Perpetual Calendar may look familiar, but it has undergone significant changes from the pre-2015 version. The glass is now arched, the case and dial have been subtly redesigned, and the automatic movement boasts twin barrels and a 7-day power reserve. This watch features a perpetual calendar with a four-digit year display, which originated from the 1985 Da Vinci and its Kurt Klaus-designed module. The 5033 model has a traditional moonphase window, while the