The Excalibur Bi-Retrograde Calendar by Roger Dubuis

This year, Roger Dubuis celebrates its 30th anniversary, and for the occasion, the company pays tribute to its co-founder’s favourite complication: the bi-retrograde display.

This function, previously featured in the Excalibur Grande Complication alongside a dozen other highly complex mechanisms, takes centre stage once again. The Maison has also introduced a less complicated, more classic edition to further honour the bi-retrograde display.

Also referred to as “the ecliptic counters” by the Maison a nod to their elliptical shape and distinctive role in indicating the months and date the design showcases a symmetrical dial layout. Enhanced by refined detailing, it pays homage to the Maison’s early creations from 1996.

Glossary

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Glossary
century leap year

century leap year

A century leap year refers to a specific year within a century that is considered a leap year in the Gregorian calendar. Normally, a leap year occurs every four years, but there is an exception for century years. According to the rules of the Gregorian calendar, a century year is only considered a leap year if it is divisible by 400. This means that years such as 1600 and 2000 are leap years, while years like 1700, 1800, and 1900 are not. This rule helps maintain the accuracy of the calendar system and ensures that the length of a year remains consistent over time.