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
Marine chronometer

Marine chronometer

Is a specialized timekeeping device used in marine navigation to determine longitude at sea. It is designed to maintain precise time even in challenging maritime environments. The marine chronometer has played a crucial role in the history of marine navigation by enabling sailors to accurately calculate their longitudinal position. By comparing the chronometer's time with a known reference time, such as Greenwich Mean Time (GMT), sailors can determine their location at sea. These chronometers are typically housed in sturdy and shock-resistant cases and often equipped with gimbals to ensure stability on a moving ship. The development of accurate marine chronometers has revolutionized navigation, making sea travel safer and more efficient.