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
Isochronism

Isochronism

In watches refers to the ability of a watch to keep consistent time regardless of the power reserve or the amount of winding. A watch with good isochronism will maintain the same accuracy throughout its running time, this is achieved through the use of a high-quality balance wheel and hairspring system, which ensures that the oscillations of the balance wheel remain consistent and regular. Isochronism is an important quality in a watch as it ensures reliable timekeeping and accuracy over an extended period.