In 2010, IWC released the elegant Portugieser Perpetual Calendar 5023. This timepiece combines their automatic 7-day movement with Kurt Klaus' brilliant perpetual calendar design, which was first seen in the Da Vinci in 1985. The updated version fits perfectly with the larger dimensions of the 7-day movement. The watch boasts a 42.2mm case and sapphire glass on both sides. One of its notable features is the 'Single Moon' moonphase display, making it easy to read the moon's phase in either hemisphere. In 2014, the IW5023-08 was introduced, featuring a sleek stainless steel case and black dial.