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
Tachymeter

Tachymeter

Is a gauge that measures the speed of a moving object over a specific distance. It is usually found on the edge of the bezel or the outer rim of the watch dial. It is used to measure speed based on elapsed time. The tachymeter scale is typically marked with units of speed such as kilometers per hour (km/h) or miles per hour (mph).

The timing function starts working like a chronograph and measures the time it takes to travel a certain distance. Then, you can read the speed of the moving object on the tachymeter scale based on the elapsed time. The tachymeter scale is commonly used in sports such as car racing and other activities that rely on speed.