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
Power Reserve

Power Reserve

Also known as a remaining power indicator, the power reserve is an indicator that shows the amount of remaining energy in a watch. It indicates the duration of the watch's operation after the main power source, such as manual winding or automatic self-winding, stops. The remaining power is displayed through a sub-dial, an indicator on the main dial, or through dedicated markings, with the display method varying from watch to watch.

The remaining power is usually expressed in units of time, such as hours or days. The duration of the power reserve varies from watch to watch and depends on several factors, such as the type of operating mechanism, the size of the movement, the type of power source, and the functions present in the watch. The power reserve capacity can range from several hours to several days.