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
Pendulum

Pendulum

The pendulum is the swinging weight (back and forth) in mechanical pendulum clocks or some specialized timepieces. The pendulum swings in a regulated manner to regulate the timekeeping function of the clock.

Typically, a pendulum consists of a long metal rod with a circular disc at its end, suspended from a fixed point inside the clock movement. It swings under the influence of gravity, and its motion is controlled by the escapement mechanism or the main spring, which provides regular impulses to keep the pendulum moving.

The oscillating motion of the pendulum regulates the time and governs the movement of the clock's gears and hands. It divides time into equal periods with precise and regular oscillations, allowing for accurate timekeeping. The length, weight, and design of the pendulum are carefully calibrated to achieve the desired accuracy in displaying time.