In 2015, IWC celebrated the 75th anniversary of the Portugieser watch by revamping almost the entire collection. They introduced new models and complications, and updated many of the existing ones. The Portugieser Perpetual Calendar from that year may look familiar, but it underwent significant changes from the pre-2015 version. The most noticeable differences include the curved glass, redesigned case and dial, and an automatic movement with a 7-day power reserve and pellaton winding system. This watch also features a perpetual calendar with a four-digit year display, inspired by the 1985 Da Vinci and its Kurt Klaus-designed module. The IW5033-02 model has a red gold case, silver dial, and is