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.

Vertex

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Vertex, a British watch brand with a storied history dating back to 1916, was founded by Claude Lyons to produce military timepieces for the British Army. Like many other brands, Vertex struggled during the Quartz Crisis, ultimately ceasing production in 1972.

In 2016, Don Cochrane, the great-grandson of Claude Lyons, revived the brand with a mission to honor his family's legacy and reintroduce Vertex's exceptional craftsmanship to a new generation of enthusiasts.