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
COSC

COSC

Contrôle Officiel Suisse des Chronomètres, is an independent Swiss organization responsible for certifying the performance and accuracy of mechanical watches through a series of tests on watch movements. It is considered one of the highest standards in the watch industry for measuring the performance and accuracy of watches.

The watch movement undergoes a series of rigorous tests and measurements under various temperature conditions over a specified period, typically up to 15 days. These tests evaluate the performance and accuracy of the watch.

To achieve the COSC certification, the average daily rate of the watch must fall within a specific range of -4 to +6 seconds per day. This means that the watch should not deviate more than -4 to +6 seconds from the exact time over a 24-hour period. Additionally, the movement must meet specific criteria for accuracy, stability, and reliability.