Bell & Ross Unveils The New BR-X3 Micro-Rotor Limited Edition
Bell & Ross expands its experimental watchmaking portfolio with the new BR-X3 Micro-Rotor, a limited-edition timepiece that combines the brand’s unmistakable square case design with an innovative movement-focused construction.

Created as a more accessible interpretation of the brand’s high-complication BR-X series, the new model stands out through its architectural aesthetics, slim profile, and integrated movement-case concept.
A Case Built Around the Movement
The most distinctive feature of the BR-X3 Micro-Rotor is undoubtedly its 40 mm square case, which adopts a sophisticated three-layer construction.
The watch features a central stainless steel structural frame, positioned between two sapphire crystal sections that act as both the front crystal and the exhibition caseback. The entire assembly is secured by the signature visible screws positioned at each corner, a design cue that has become synonymous with Bell & Ross.

What makes this construction particularly remarkable is that the steel central section is not merely a housing for the movement — it is directly integrated into the calibre’s architecture.
Rather than using a traditional movement fitted inside a separate case, Bell & Ross has designed the watch so that the case middle itself functions as the supporting structure for the movement bridges. This engineering solution creates a seamless fusion between the external architecture and the internal mechanics.
Industrial-Inspired Openworked Layout
The openworked dial side reveals a highly structured movement layout, defined by bridge lines that create a geometric grid effect.

This architectural arrangement gives the BR-X3 Micro-Rotor a distinctly industrial aesthetic, reinforcing the brand’s strong connection to technical instrument design. The visible mechanical elements include the micro-rotor, gear train, and openworked barrel, all carefully arranged to enhance depth and symmetry.
The result is a modern, technical display that emphasizes the movement as the visual centerpiece of the watch.
BR-CAL.390 Micro-Rotor Movement
Powering the BR-X3 Micro-Rotor is the BR-CAL.390 automatic movement, equipped with a micro-rotor winding system.
The use of a micro-rotor is a key technical highlight, as it allows the winding mass to sit flush within the movement architecture instead of being mounted above it like a conventional rotor.

This construction helps maintain a notably slim profile, enabling the watch to measure only 9mm in thickness, which is impressive for a watch featuring such an elaborate openworked design and square case format.
The movement delivers a 48-hour power reserve, offering reliable daily wear performance while maintaining the sleek proportions of the case.
Practical Everyday Specifications
Despite its unconventional construction, the BR-X3 Micro-Rotor retains solid everyday usability.
The watch offers 50 meters of water resistance, which provides adequate protection for regular daily use and occasional exposure to water.

Its sapphire sandwich construction also ensures excellent visibility of the movement from both sides, further emphasizing the mechanical artistry of the piece.
Limited to 99 Pieces
Bell & Ross will produce the BR-X3 Micro-Rotor as a limited edition of 99 pieces, adding an element of exclusivity to this technically ambitious release.
The watch is priced at € 22,000, positioning it within the brand’s high-end experimental collection while remaining significantly more attainable than the BR-X3 Tourbillon Micro-Rotor introduced previously.
With its integrated case-movement architecture, slim micro-rotor calibre, and striking industrial design, the BR-X3 Micro-Rotor represents one of the most technically interesting releases from Bell & Ross this year.
Read more here.
General Specifications:
Brand: Bell & Ross
Model: BR-X3 Micro-Rotor
Reference: BRX3M-MR-ST/SCA
Dial: Skeletonised
Case Material: Stainless steel
Case Dimensions: 40 mm Width, 9 mm thickness
Crystal: Sapphire glass
Case Back: Sapphire glass
Water Resistance: 50 Meters
Strap: Grey calfskin leather with alligator pattern and a steel folding clasp
Calibre: BR-CAL.390
Functions: Hours, minutes
Winding: Automatic with micro-rotor
Power Reserve: 48 Hours
Price: € 22,000
Limited Edition: Yes, 99 pieces



