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
Large Date

Large Date

It is a complex function of the date display, usually shown through two separate large windows on the main dial, one for the tens place (displaying two digits) and the other for the units place (displaying a single digit), making it easier and faster to read the date.

This date complication can be displayed on two overlapping discs within the main dial (one containing 15 numerals and the other containing 16) for proper fit. This makes the complication more difficult and consequently more expensive to manufacture.