The IWC Portugieser Perpetual Calendar 5023 was released in 2010, combining the reliable 7-day self-winding movement from IWC with Kurt Klaus' genius perpetual calendar technology. This feature was originally used in the 1985 Da Vinci and was adapted to fit the larger 7-day movement. The watch has a 44.2mm case and sapphire glass on both the front and back. One of its standout features is the 'Double Moon' display, which lets you check the moonphase in both the northern and southern hemisphere. In 2011, the IW5032-03 was introduced, featuring a white gold case and a blue dial.