The perpetual calendar movements brought to life by master watchmaker Kurt Klaus in 1985 continue to inspire some of IWC’s most beautiful timepieces today. The Portugieser Perpetual Calendar 44 is one such model, blending mechanical ingenuity with aesthetic elegance.
Let’s take a step back in time: it’s the 1985 Basel Fair. That year, IWC unveiled the Da Vinci Perpetual Calendar Chronograph (Ref. 3750), a revolutionary timepiece designed by one of the century’s greatest watchmakers, Kurt Klaus. Its most significant innovation, which is a first in horology, was that all calendar indications could be adjusted solely via the crown. The movement could automatically account for months of varying lengths, add a leap day every four years, and operate without manual correction until the year 2100. This ingenious and complex mechanism became a source of inspiration for many of IWC’s subsequent creations, marking a milestone in the history of perpetual calendars.
IWC introduced its first Portugieser perpetual calendar in 2003, and over the years the collection expanded with numerous models. In 2024, the Portugieser Eternal Calendar once again captured attention, featuring a moon phase accurate for 45 million years, a timepiece that won the Grand Prix d’Horlogerie de Genève that same year. Another star from that year was the Portugieser Perpetual Calendar 44 (Ref. IW503702).
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