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IWC Schaffhausen

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IWC Schaffhausen

WATCHES AND WONDERS 2024

A Tribute to Eternity

An intricate mechanism, reaching further into the future than ever before – capturing the beauty of time and eternity.

A watch that precisely reproduces the Gregorian calendar’s complex rules, irregularities and exceptions – for thousands, even millions of years to come.

We are building on our comprehensive expertise in engineering mechanical calendars - and pushing the boundaries in watchmaking once again.

Front image showcasing the Eternal Calendar Watch

Introducing:

the Portugieser Eternal Calendar

IWC Schaffhausen’s first secular perpetual calendar automatically takes into account the Gregorian calendar’s leap year exception rules by skipping three leap years over 400 years. It also features a moon phase display with an accuracy of 45 million years.

Product video of the Eternal Calendar Watch featuring multiple views of the watch
Detailed Image of the back of the Eternal Calendar Watch showcasing its mechanism Detailed Image of the back of the Eternal Calendar Watch showcasing its mechanism from a different angle

TAKE A LOOK AT WHAT’S UNDERNEATH THE DIAL

Interactive animation of the Eternal Calendar watch that allows the user to see what is underneath the dial of the watch Interactive animation of the Eternal Calendar watch that allows the user to see what is underneath the dial of the watch

MONTH CAM

As in a regular perpetual calendar, the mechanical calendar program is based on a disc containing a four-year cycle with 48 months, in which three common years followed by a leap year.

400-YEAR WHEEL

The 400-year wheel reflects the Gregorian calendar’s leap year exceptions. It completes just one revolution every four centuries and makes sure that the calendar skips three leap years over that period – an event that will take place in 2100 for the first time.

MOON PHASE REDUCTION GEAR

On its orbit around the Earth, the moon does not follow a daily rhythm. One complete cycle from new moon to new moon does not last 30 days, but 29 days, 12 hours, 44 minutes and 2.88 seconds. To display the moon phase on the dial of a watch, the duration of one calendar months must be reduced to one lunar cycle. This is achieved by placing a reduction gear between the base movement and the moon phase disc.

DOUBLE MOON™ DISPLAY

The Double Moon™ indication uses two superimposed discs to display the moon phase as seen from the Northern and Southern hemispheres on the dial.

Interactive animation of the Eternal Calendar watch that allows the user to see what is underneath the dial of the watch

See the Watch Face

See the Mechanism

Can precision be eternal? Our engineers set themselves the challenge of developing a moon phase display with unprecedented accuracy.

After computing simulations for more than 22 trillion combinations of wheels, they devised a new moon phase reduction gear with three intermediate wheels.

The Double Moon™ display of the Portugieser Eternal Calendar will – theoretically – only deviate from the moon’s actual orbit by one day after …

45,000,000 YEARS.

On that particular issue, however, you will just have to take our word for it…

EXPLORE ALL WATCHES IN THE NEW PORTUGIESER COLLECTION

Discover more

IWC Schaffhausen