In mechanical watchmaking, every movement begins with rotation. The mainspring unwinds inside the barrel, the gear train revolves, and every pivot turns around its axis. Circular motion is the visible expression of the entire kinematic architecture of a mechanical watch.
When everything is functioning properly, a watch is built around continuous rotation.
Yet there is nothing that says information must always be displayed this way. To improve readability, create visual balance, or enrich the composition of a dial, an indication can instead travel across an arc, much like a gauge. The result is a display with greater tension, depth, and sometimes even a touch of theatricality. Rather than endlessly circling a central point, the hand progresses toward a defined limit before instantly returning to where it began. That is the essence of a retrograde complication.
Roger Dubuis has turned this unconventional display into one of its defining signatures. On the Excalibur Bi-Retrograde Calendar, the concept appears twice, governing both the day of the week and the date.
A retrograde hand embodies a carefully engineered paradox. Throughout most of its journey, it advances with complete regularity. Once it reaches the end of its scale, however, it must snap back to its starting position in a single, decisive motion. Selecting a retrograde display therefore has major consequences for the movement beneath the dial: the mechanism must guide the hand forward, establish a stopping point, store energy throughout the journey, and then release it at exactly the right instant.
In a conventional design, this sequence is typically managed by a cam, a rack, and a spring. The cam dictates the progression, the rack transfers the motion, and the spring accumulates the energy needed for the return.
Picture someone slowly drawing a bow. As the string is pulled back, energy is gradually stored. The instant it is released, that energy is unleashed all at once. The principle itself is straightforward, but reproducing it reliably inside the confined space of a watch caliber is anything but simple.
Roger Dubuis and Jean-Marc Wiederrecht approached the retrograde mechanism from a different perspective. Beginning in 1989, they reengineered its architecture with a cleaner, more streamlined design. Their solution notably replaced traditional blade springs with balance springs positioned directly on the hand pinions instead of the rack, while also introducing a completely redesigned cam. In practical terms, the return mechanism is relocated much closer to the hand it controls.
In watchmaking, that proximity makes a real difference. The shorter the path the energy has to travel, the more accurately the hand's movement can be regulated.
A door offers a useful comparison. In a traditional arrangement, a door closer behaves like a spring mounted away from the hinges, pulling the door shut from a distance. Roger Dubuis' solution is closer to integrating the return mechanism directly into the hinges themselves. Rather than acting externally, the restoring force operates immediately around the pivot point. Instead of pulling the motion back from afar, the return is managed exactly where the movement originates.
This philosophy is just as evident on the dial. On the Excalibur Bi-Retrograde Calendar, the day and date are not confined to apertures or small subdials. They unfold across two generous sectors, each animated by an angled, skeletonized hand. The calendar itself becomes an active part of the visual experience.
Surrounding these two retrograde displays, the dial develops its sense of depth through a succession of layers: a finely detailed flange, rhodium-plated counters, a circular-brushed central plate, a small seconds display at 6 o'clock, and the openworked RD840 caliber visible beneath. The cosmic blue finish ties the entire composition together without dominating it. Rather than becoming the focal point, it establishes the mood, lending even greater richness to an already expressive architecture.
Perhaps this is where the true fascination of the retrograde complication lies. It balances visual freedom with strict mechanical discipline. By abandoning the traditional circular display, the hand gives the dial entirely new possibilities while challenging the movement to solve the problem from a completely different angle.
FAQ:
Q: What is the Roger Dubuis Excalibur Biretrograde Calendar?
A: The Roger Dubuis Excalibur Biretrograde Calendar is a watch that displays the day of the week and the date across two large retrograde sectors, indicated by angled, skeletonized hands. The openworked RD840 caliber powers this mechanism, developed in collaboration with Jean-Marc Wiederrecht.
Q: What is a complication watch?
A: A complication watch is a mechanical timepiece that goes beyond displaying the hours, minutes, and seconds by adding an additional function, such as a calendar, a minute repeater, or a retrograde display, like the one developed by Roger Dubuis.
Q: What is a retrograde watch?
A: A retrograde watch is a timepiece in which a hand does not rotate continuously around the dial but instead travels along an arc, advances to a fixed limit, then instantly jumps back to its starting point. The mechanism typically relies on a cam, a rack, and a spring.
Q: How much does a Roger Dubuis watch cost?
A: Roger Dubuis watches are positioned at the high end of Swiss watchmaking, with the Geneva-based manufacture focusing on in-house calibers such as the RD840 and sophisticated complications like the biretrograde calendar. The exact price depends on the model and its finishing.
