This year IWC celebrates the 75th anniversary and with it, a whole new range of calibres and timepieces from the Portugieser collection were unveiled at the Salon International de la Haute Horlogerie SIHH 2015 in Geneva. In addition to the unveiling of 14 new timepieces, the Portugieser line went through a thorough facelift that IWC Schaffhausen refers to as the 'Evolutionary Aesthetic Enhancements'. These enhancements included adding new integrated strap horns to improve ergonomics, an arched-edge sapphire crystal and new handmade alligator leather straps done by Italian renowned shoemaker Santoni —straps come with an orange lining just like the shoes from this brand.

The Portugieser Perpetual Calendar ref. 503401 features now, for the first time ever, a new dial design with railway-track-style chapter ring and aesthetically enhanced subdial arrangement to improve readability.