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
Rotor (central rotor) or oscillating weight

Rotor (central rotor) or oscillating weight

It is the semi-circular weight also known as the oscillating weight, usually made of gold or platinum. It is attached to the center of the watch movement and partially covers the movement. It is associated with automatic self-winding mechanisms and rotates with the movement of the wearer's wrist. The rotor continuously winds the main spring, ensuring the watch operates without the need for manual winding or hand winding. The rotor can rotate in one direction or bidirectionally. It is typically installed in the back of the watch and is often visible through the transparent case back.