The IWC Portugieser Perpetual Calendar 5023 made its debut in 2010. It combined IWC's self-winding 7-day movement with Kurt Klaus' clever perpetual calendar module, which was first used in the 1985 Da Vinci model. The module was modified to fit the larger size of the 7-day movement. The watch sported a 44.2mm case and had sapphire glass on both the front and back. One standout feature was its 'Double Moon' moonphase display, allowing the user to check the moonphase in both the northern and southern hemispheres. The IW5032-02 version, featuring a black dial and a red gold case, was released in 2011