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
Bicompax

Bicompax

Bicompax is a term used in watchmaking to describe a type of chronograph display layout that features two sub-dials symmetrically arranged on the dial. Typically, these sub-dials are located at the 3 o'clock and 9 o'clock positions on the dial, with the chronograph minute counter located at 3 o'clock and the running seconds sub-dial at 9 o'clock.

The term "bi" in bicompax refers to the fact that there are two sub-dials, while "compax" is short for "complex" or "complicated". The bicompax layout is a popular and classic design for chronographs, and is often used in vintage-inspired timepieces.