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
Telemeter

Telemeter

Is a feature found in some watches that allows the user to measure the distance between the watch and a visible or audible event. It is typically used to determine the distance of a lightning strike or other events. For example, the chronograph hand is activated upon seeing the lightning and stopped upon hearing the thunder.

The Telemeter scale is usually placed on the outer edge of the watch dial or on a subdial. It works based on the principle of sound transmission through the air at a known speed. When observing the event, such as a lightning flash, the wearer starts the chronograph function. The wearer stops using the chronograph when hearing the sound of the event, such as thunder. By reading the corresponding point on the Telemeter scale where the chronograph hand stopped, the user can approximate the distance of the event.