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
Ratchet wheel

Ratchet wheel

Is a gear-like component that is located on top of the barrel. It is attached to the arbor of the barrel using a screw. When the watch is being wound, the ratchet wheel turns and helps in coiling the mainspring tightly, storing potential energy. This energy is later released to power the watch's movement. The ratchet wheel is designed to rotate in one direction only, preventing the mainspring from unwinding in the opposite direction. It is an essential part of the winding mechanism that ensures the efficient and controlled winding of the watch.