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.

Fortis

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Fortis is a Swiss watch brand founded in 1912 in Grenchen, Switzerland. The company specializes in producing high-quality mechanical watches, particularly for aviation professionals and divers.

Fortis has a long history of producing aviation watches, and its watches have been used by pilots and astronauts in a variety of missions. In 1962, the brand became the official watch supplier for the US space program.

Fortis' watch collections are known for their durability and reliability, and many of its models feature features such as water resistance, shock resistance, and anti-magnetic shielding. The brand's most popular collections include the Aviatis, Cosmonauts, and Aquatis lines.

Today, Fortis is owned by Jupp Philipp, who acquired the company in 2018. The brand continues to produce high-quality mechanical watches and is popular among collectors.