Portugieser Eternal Calendar by IWC

EDITOR'S REVIEW

• The Portugieser Eternal Calendar by IWC was presented at Watches & Wonders 2024
• This watch is accurate to 45 million years. Thanks to the introduction of a new 400-year gear that makes one rotation every 400 years and, due to its three indentations, it makes sure the calendar skips the three leap years over that period
• This mechanical detail also admits IWC into the “secular perpetual calendar” club. This rare form of perpetual calendar, which is so advanced it can account for exceptional non-leap years, such as 2100, 2200 etc, is made only by the likes of Patek Philippe, which made one in pocket watch form for its 150th anniversary in 1989, Sven Andersen, and Franck Muller, due to the complexity of its gearing
• To cope with the 45m-year non-adjustment span, IWC had to place a new three-wheel reduction gear train in between the base movement and the moonphase disc so that its double moonphase, which shows the moon in both hemispheres, will only deviate by one day in 45m years. Again, we’ll just have to take IWC’s word for it
• Click  "Buy now"  to find out more on the brand's website