Meet MB&F Horological Machines (ref. 40.RSL.R), a distinctive model that balances proportion, precision, and presence. On the wrist, the case feels purposeful: measuring 54 mm in diameter, with a thickness of 24 mm, defined by a round silhouette. The caseback is open, and the crystal is sapphire. Visually, the face is where character emerges: a black tone, framed by arabic numerals hour markers, and proprietary hands. Mechanically, the watch prioritizes accuracy: the HM4 caliber. Issued as a limited edition, appealing to focused collectors. The silhouette offers presence without excess, lending confidence in a range of situations. Finishing showcases disciplined attention to detail across facets, edges, and surfaces. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.