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
Altimeter

Altimeter

An altimeter is a device that measures altitude or elevation above sea level. It is commonly used in aviation, mountaineering, and other outdoor activities to help determine one's location and to aid in navigation.

An altimeter can work based on various principles, such as barometric pressure or GPS technology. A barometric altimeter measures altitude by measuring the atmospheric pressure, which decreases as the altitude increases. The device contains a small aneroid barometer that expands or contracts with changes in air pressure, which moves a needle on the display to indicate the current altitude.

Altimeters are commonly found in watches designed for outdoor activities, as well as in dedicated handheld devices used by hikers, climbers, and pilots. They often include additional features, such as temperature readings and weather forecasting.

Mechanical wristwatches with altimeter features are relatively rare, as most altimeter watches use electronic sensors to measure altitude.