The Bell & Ross BR-X3 Micro-Rotor: Case and Movement as One

Bell & Ross has consistently focused on the square as a design leitmotif since the introduction of the BR-01 model in 2005. With the BR-X3 line, which debuted in 2025 with the Tourbillon Micro-Rotor, the brand opened another chapter: no longer just the square as a formal reference, but as a constructive principle.

The BR-X3 Micro-Rotor, introduced in 2026 and limited to 99 pieces, is the more accessible variant of this philosophy. Accessible not in the sense of compromise, but in the sense of reduction: no tourbillon, but rather a more consistent focus on architecture.

Case and Movement as a Unit 

What technically distinguishes the BR-X3 Micro-Rotor from conventional watches is its fundamental constructive decision: the 40 mm steel case takes on the function of the movement plate. Bridges and the middle case form a single block, capped above and below by sapphire crystal. The result is a total of three components: the steel block and upper and lower sapphire crystals. For a manufacture watch, this is an unusually clear construction logic.

This decision has immediate consequences for the readability of the movement. A skeletonized, partially open dial offers a view of the movement from both the front and back. The bridges run horizontally and vertically, their grid not coincidentally reminiscent of Mondrian, as Bruno Belamich, Creative Director at Bell & Ross, refers to Charlotte Perriand and Piet Mondrian as references. The arrangement of the bridges follows a graphic composition principle that goes beyond pure functionality.

Caliber BR-CAL.390: Thinness through Micro-Rotor 

At the center works the manufacture caliber BR-CAL.390 with automatic winding via a micro-rotor. The decision for a micro-rotor is technically justified: unlike a conventional central rotor, which sits on top of the movement and increases its overall height, the micro-rotor is integrated into the caliber.

This allows for an overall case height of 9 mm with a width of 40 mm. Other technical specifications include a 48-hour power reserve and water resistance up to 50 meters. The time display is limited to hours and minutes; there is no seconds hand. The running balance visually replaces the seconds. The hands are rhodium-plated and filled with white Super-LumiNova BGW9, resulting in a blue luminescent color at night — a functional decision that fits the instrumental character of the watch.

Monochrome Steel Without Evasions 

The surfaces of the BR-X3 Micro-Rotor are consistently executed in steel — rhodium-plated, satin-finished, microblasted, and partially polished. This gives the movement a visual coherence that is consistently maintained. Each surface reflects light differently, giving the skeletal structure a certain depth without relying on color accents. The strap, made of gray calfskin with a crocodile pattern, and the clasp, in polished and satin-finished steel, continue this monochromatic approach.

Where does the BR-X3 Micro-Rotor stand in the market? Bell & Ross positions itself with the BR-X3 line in the segment of conceptual haute horlogerie. The brand has consistently developed its manufacturing capabilities in recent years and now presents a constructively independent solution that differs significantly from conventional skeletonization approaches. The limited run of 99 pieces suggests collector status without overstating exclusivity. The price is $22,500.

To learn more, visit Bell & Ross, here.