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
Hertz (Hz)

Hertz (Hz)

Is a unit of measurement for frequency, representing the number of cycles or oscillations per second. This unit is used to describe the frequency of a watch's movement or the vibrations of a balance wheel.

Traditional mechanical watches typically operate at frequencies ranging from 2.5 to 4 Hz, which means the balance wheel completes 2.5 to 4 oscillations per second. This frequency is sometimes referred to as "beats per hour" or "vibrations per hour," indicating the number of oscillations the watch's movement performs in one hour. On the other hand, modern high-frequency watches, such as those equipped with quartz movements or certain mechanical movements, can operate at much higher frequencies. For example, quartz watches typically operate at a frequency of 32,768 Hz, making them more accurate in timekeeping.