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
Hacking seconds ( stop seconds mechanism )

Hacking seconds ( stop seconds mechanism )

Hacking seconds, also known as "hack seconds," is a feature that allows the seconds hand to be stopped or "hacked" when the crown is pulled out to set the time. When the crown is in the time-setting position, the hacking seconds mechanism is engaged, causing the seconds hand to stop moving. .....................................................................................................................

This feature enables precise time synchronization and facilitates accurate watch adjustment. Once the time is set, pushing the crown back in activates the movement, and the seconds hand starts moving again from the exact position where it was stopped. The hacking seconds function is commonly found in mechanical watches.