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
Moon Phase

Moon Phase

The moon phase complication displays the complete cycle of the moon through a window or aperture on the watch dial. This window contains a small disc that represents the phases of the moon and is moved by a specific mechanism to indicate these phases. The display can be adjusted manually or automatically, depending on the design and internal mechanics of the watch.

The moon phase cycle consists of four phases: new moon, first quarter, full moon, and last quarter. This complication employs a precise mechanism to move the disc in a way that reflects the actual movement of the moon in the sky. Typically, the display is accompanied by other indicators, such as the basic timekeeping functions of hours, minutes, and seconds.