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
frequency

frequency

the number of vibrations performed by the hairspring per hour. Frequency is an important indicator of accuracy and performance in a watch. The higher the frequency, the greater the accuracy and stability in timekeeping. A higher frequency improves the watch's accuracy and reduces the impact of external factors on its movement. Conversely, a lower frequency reduces the accuracy of the watch and makes it more susceptible to external changes. The frequency of a watch is measured in hertz (Hz).

The frequency of a watch varies among different timepieces and depends on the internal movement of the watch. In automatic mechanical watches, the frequency typically ranges from 2.5 Hz to 5 Hz, which translates to 2.5 to 5 vibrations per second. On the other hand, in quartz watches, the frequency is very high and can range in the tens of thousands of hertz.