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.

Corum

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Corum was founded in La Chaux-de-Fonds, Switzerland, by Gaston Ries and his nephew, René Bannwart, in 1955. One year later, the first Corum's watches were produced. Corum's claim to fame came early on when the company introduced a watch made out of a $20 gold coin, which was an instant best-seller.

Corum offers a range of watch styles, including classic dress watches, sporty chronographs, and diving watches. Many of their watches feature unique designs and complications, such as the Admiral's Cup watch which has a distinctive 12-sided case and nautical pennants on the dial.

Corum is also known for its limited edition watches, which are produced in small numbers and often feature intricate designs and rare materials. These watches are highly sought after by collectors and watch enthusiasts.