Experience the craft of MB&F in the Horological Machines (ref. 55.ZL.B), a distinctive model that balances proportion, precision, and presence. On the wrist, the case feels purposeful: measuring 51.5 mm in diameter, with a thickness of 22.5 mm, defined by a round silhouette. The caseback is open, and the crystal is sapphire, delivering water resistance to 3000 meters. 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 HM5 caliber. Issued as a limited edition, appealing to focused collectors. Introduced in 2013. 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.