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.

Grönefeld

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Grönefeld

is a Dutch luxury watch brand founded by brothers Tim and Bart Grönefeld in 2008. The brand is known for its high-quality timepieces that combine traditional watchmaking techniques with innovative design.

Grönefeld watches are handmade in the brand's atelier in the Netherlands, and each timepiece is crafted with meticulous attention to detail. The brand's most famous watch is the Parallax Tourbillon, which features a unique tourbillon mechanism that is designed to improve the accuracy of the watch.

Grönefeld is also known for its use of high-quality materials, such as precious metals and rare gemstones, and for its innovative approach to watch design. The brand has won numerous awards for its timepieces, including the prestigious Grand Prix d'Horlogerie de Genève award in 2014 for its Parallax Tourbillon watch.

Today, Grönefeld produces a range of high-end watches, including dress watches, sports watches, and complicated watches such as tourbillons and perpetual calendars. The brand is highly regarded by watch collectors and enthusiasts for its exceptional craftsmanship and innovative design.