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
Caliber

Caliber

Caliber, is a term that describes the engine of a mechanical watch, through a reference number for each watch, and this number indicates the size and shape of the watch movement, and is also used to identify the origin of the watch or its maker.

Each watch manufacturer or brand typically has its own set of calibers, which may vary in terms of design, complexity, and features.

Calibers can be categorized into different types, such as manual-winding calibers that require manual winding of the crown to keep the watch running, or automatic calibers that use a rotor to automatically wind the mainspring through the movement of the wearer's wrist. There are also quartz calibers, which are powered by a battery and utilize electronic circuits to regulate timekeeping.

The caliber number or code is often assigned by the manufacturer to identify a particular movement or model. It helps watchmakers, collectors, and enthusiasts differentiate between different watch models and understand the technical specifications and features of a specific watch.