Roger Dubuis brings a biretrograde perpetual calendar to the Excalibur

Roger Dubuis revisits one of its founding design ideas in the 2026 Excalibur Biretrograde Perpetual Calendar. Two hands trace arcs for the day and date before snapping back to the start, making the calendar mechanism part of the watch's visual performance.

The new self-winding RD850 calibre accounts for month lengths and leap years while also driving an astronomical moonphase accurate to within one day over roughly 122 years. The movement carries the Poinçon de Genève certification and has a stated 60-hour reserve.

A 40mm pink-gold case frames a complex dial built in multiple layers of Astral Blue, pink gold and mother-of-pearl. Beneath the sculptural front, the sapphire caseback gives a view of the movement's finishing and winding rotor.

The Excalibur is a reminder that a perpetual calendar need not hide its complexity behind an austere dial. Here, the structure of the display is the design.