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
perpetual calendar

perpetual calendar

Is a complication that displays the complete calendar information, including the date, day, month, and leap year. It operates with an automatic adjustment mechanism for months that have 30 or 31 days, as well as the leap year cycle where February has 29 days.

Watches with this complication may include additional features, such as displaying the phases of the moon. The mechanism of the perpetual calendar involves a series of gears, levers, and discs that work together to track time and ensure an accurate display of calendar information.