IWC introduces the new Portugieser Eternal Calendar, the manufacture's first “secular” perpetual calendar which takes into account the different lengths of the months and adds a leap day every four years, whilst also taking into account the Gregorian calendar’s complex leap year exceptions.

Over a timespan of 400 years, it will skip three leap years that would normally occur at the end of a century. In addition, its moon phase display has an exceptionally high accuracy, with a deviation of one day in 45 million years.

The Portugieser Eternal Calendar boasts an intricately finished platinum case with polished and brushed surfaces, a white lacquered glass dial and a double box-glass sapphire crystals. The glass dial lends the printing and appliques a floaty lightness. The characteristic minute scale is printed on a white lacquered flange sitting between the glass dial and the front glass.