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
Tritium

Tritium

Is a type of radioactive material used in some watches to illuminate the markers and hands in the dark. Tritium is a beta-emitting radiation material, and it emits light when it interacts with a phosphorescent material in a small glass tube inside the watch.

Watches that contain tritium provide independent illumination for the markers and hands for a long period in the dark without the need for external light sources such as sunlight or artificial lighting. Tritium emits a stable and continuous light for a duration of up to 10-15 years, thanks to its radioactive properties.

One of the advantages of using tritium in watches is that it is not affected by weather conditions or surrounding light sources, making it useful for use in various climatic conditions and in dark environments.