[Roger Dubuis] Where Astronomy and Excellence in Geneva Watchmaking Meet: The Birth of the Excalibur Bi-Retrograde Perpetual Calendar
Roger Dubuis unveils the Excalibur Bi-Retrograde Perpetual Calendar featuring the new RD850 caliber. It boasts an astronomical moon phase accurate for 122 years and the Maison's iconic bi-retrograde display, certified by the Geneva Seal.
📋 Article Processing Timeline
- 📰 Published: April 15, 2026 at 01:00
- 🔍 Collected: April 14, 2026 at 16:31
- 🤖 AI Analyzed: April 19, 2026 at 15:04 (118h 32m after Collected)
An improved perpetual calendar movement has been realized with the introduction of the newly developed RD850.
A piece honoring the complication most cherished by Mr. Roger Dubuis.
At the intersection of astronomy and exceptional Geneva watchmaking, Roger Dubuis unveils a new timepiece guided by the rhythm of celestial bodies. Serene and full of grace, this creation not only accurately measures the passage of time on Earth but also meticulously tracks the phases of the moon. All of this is expressed through the Maison's distinctive aesthetic and a newly evolved caliber.
Excalibur Bi-Retrograde Perpetual Calendar
Like all Roger Dubuis creations unveiled at Watches and Wonders Geneva 2026, the Maison draws inspiration from stellar observations that have shaped humanity's understanding of celestial motion and time and space. Through precise calendar mechanisms and advanced time displays, these new pieces do more than merely indicate the time. They pay tribute to the movement and beauty of the universe extending beyond Earth, while simultaneously awakening the imagination and embodying the precision and mystery inherent in the cosmos.
Connection to Complications
Mastering the perpetual calendar is one of the most arduous quests in watchmaking, and it was a challenge that strongly captivated Mr. Roger Dubuis. In developing this complication, which demands a lavish investment of time and a passionate approach, his patient and quietly diligent nature was ideal. As a result, the perpetual calendar was positioned as a complication symbolizing the Maison, and for many years it has demonstrated the Maison's unwavering commitment and technical dedication.
This latest perpetual calendar adopts the Maison's iconic bi-retrograde display. The day and date displays glide smoothly along elliptical scales, returning to their starting points upon the completion of each cycle.
Since Mr. Roger Dubuis co-patented the unique bi-retrograde display with Mr. Jean-Marc Wiederrecht in 1989, and it was equipped in the Maison's first timepiece in 1996, this style has brought a special glamour and dynamism to the dial.
The perpetual calendar, one of the 'four grand' complications in watchmaking, is designed to accurately track the passage of time by accounting for the different number of days in each month and even the leap year cycle. It is not merely a mechanism that displays the time and date, but one that reveals the very structure of time itself. A perpetual calendar correctly set today will smoothly capture and display the flow of time without yielding the slightest error until the year 2100.
Improved Movement
Inside the case, it houses the new Caliber RD850, an evolution of Roger Dubuis' bi-retrograde perpetual calendar movement.
Composed of 435 parts and equipped with a power reserve of approximately 60 hours, this self-winding caliber is entirely developed and manufactured in-house at the Geneva manufacture.
A major improvement from the previous perpetual calendar movement is the introduction of a month corrector. This makes it possible to manually set the month display with a single simple operation. This enhancement makes the adjustment process quicker and easier, while also preventing excessive manipulation of the mechanism.
Astronomical Moon Phase
Further elevating the complexity of the RD850 is an astronomical moon phase at 6 o'clock that unleashes the fascination of celestial phenomena. This display is designed to track the cycle of the moon's phases, based on the 29 days, 12 hours, and 45 minutes it takes from one new moon to the next.
This moon phase display depicts the phases of the moon on the dial in almost the same shape as the moon floating in the sky. In a general moon phase mechanism, the lunar cycle is calculated as approximately 29.5 days, resulting in a one-day error every two to three years. On the other hand, this astronomical moon phase by Roger Dubuis maintains high precision for about 122 years before requiring its first adjustment, and that adjustment can be done with a single click.
Certification and Inner Angle Finishing
The quality of the RD850 is certified and guaranteed by the Poinçon de Genève (Geneva Seal). This is a prestigious certification given to the pinnacle of watchmaking by the Geneva watchmaking inspection bureau.
A piece honoring the complication most cherished by Mr. Roger Dubuis.
At the intersection of astronomy and exceptional Geneva watchmaking, Roger Dubuis unveils a new timepiece guided by the rhythm of celestial bodies. Serene and full of grace, this creation not only accurately measures the passage of time on Earth but also meticulously tracks the phases of the moon. All of this is expressed through the Maison's distinctive aesthetic and a newly evolved caliber.
Excalibur Bi-Retrograde Perpetual Calendar
Like all Roger Dubuis creations unveiled at Watches and Wonders Geneva 2026, the Maison draws inspiration from stellar observations that have shaped humanity's understanding of celestial motion and time and space. Through precise calendar mechanisms and advanced time displays, these new pieces do more than merely indicate the time. They pay tribute to the movement and beauty of the universe extending beyond Earth, while simultaneously awakening the imagination and embodying the precision and mystery inherent in the cosmos.
Connection to Complications
Mastering the perpetual calendar is one of the most arduous quests in watchmaking, and it was a challenge that strongly captivated Mr. Roger Dubuis. In developing this complication, which demands a lavish investment of time and a passionate approach, his patient and quietly diligent nature was ideal. As a result, the perpetual calendar was positioned as a complication symbolizing the Maison, and for many years it has demonstrated the Maison's unwavering commitment and technical dedication.
This latest perpetual calendar adopts the Maison's iconic bi-retrograde display. The day and date displays glide smoothly along elliptical scales, returning to their starting points upon the completion of each cycle.
Since Mr. Roger Dubuis co-patented the unique bi-retrograde display with Mr. Jean-Marc Wiederrecht in 1989, and it was equipped in the Maison's first timepiece in 1996, this style has brought a special glamour and dynamism to the dial.
The perpetual calendar, one of the 'four grand' complications in watchmaking, is designed to accurately track the passage of time by accounting for the different number of days in each month and even the leap year cycle. It is not merely a mechanism that displays the time and date, but one that reveals the very structure of time itself. A perpetual calendar correctly set today will smoothly capture and display the flow of time without yielding the slightest error until the year 2100.
Improved Movement
Inside the case, it houses the new Caliber RD850, an evolution of Roger Dubuis' bi-retrograde perpetual calendar movement.
Composed of 435 parts and equipped with a power reserve of approximately 60 hours, this self-winding caliber is entirely developed and manufactured in-house at the Geneva manufacture.
A major improvement from the previous perpetual calendar movement is the introduction of a month corrector. This makes it possible to manually set the month display with a single simple operation. This enhancement makes the adjustment process quicker and easier, while also preventing excessive manipulation of the mechanism.
Astronomical Moon Phase
Further elevating the complexity of the RD850 is an astronomical moon phase at 6 o'clock that unleashes the fascination of celestial phenomena. This display is designed to track the cycle of the moon's phases, based on the 29 days, 12 hours, and 45 minutes it takes from one new moon to the next.
This moon phase display depicts the phases of the moon on the dial in almost the same shape as the moon floating in the sky. In a general moon phase mechanism, the lunar cycle is calculated as approximately 29.5 days, resulting in a one-day error every two to three years. On the other hand, this astronomical moon phase by Roger Dubuis maintains high precision for about 122 years before requiring its first adjustment, and that adjustment can be done with a single click.
Certification and Inner Angle Finishing
The quality of the RD850 is certified and guaranteed by the Poinçon de Genève (Geneva Seal). This is a prestigious certification given to the pinnacle of watchmaking by the Geneva watchmaking inspection bureau.