IWC
Portugieser Eternal Calendar IW505701
44.4mmCurrent Production
The Portugieser Eternal Calendar is the first secular perpetual calendar from IWC Schaffhausen and automatically considers the Gregorian calendar’s leap-year exceptions. In addition, this horological marvel also features a moon phase display with a mathematical accuracy of 45 million years. The Portugieser Eternal Calendar was awarded the “Grand Prix de l’Aiguille d’Or” at the 24. Grand Prix d’Horlogerie de Genève.
Source: IWC website, last updated Mar 2026
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