In 2015, IWC celebrated the 75th anniversary of their Portugieser collection by revamping it. They added new models, complications, and updated existing ones. Among the new additions was the 2015 Portugieser Perpetual Calendar, which underwent significant changes compared to its previous version. The glass is now arched, and the case and dial have also been subtly redesigned. The automatic movement boasts a 7-day power reserve and pellaton winding system with twin barrels. This watch features a perpetual calendar with a four-digit year display, inspired by the 1985 Da Vinci and its Kurt Klaus-designed module. The current version, reference IW5034-04, has a red gold case and ardoise