Experience the craft of MB&F in the Horological Machines (ref. 81.RTL.B), a refined timepiece that blends thoughtful design with reliable performance. A study in proportion and durability: measuring 49 mm in diameter, with a thickness of 19.5 mm, defined by a round silhouette. The caseback is open, and the crystal is sapphire, delivering water resistance to 3000 meters. The dial composition is deliberate and legible: a black tone, framed by arabic numerals hour markers, and proprietary hands. Beneath the caseback lies dependable performance: the HM8 Moonmachine caliber. Produced in limited numbers, appealing to focused collectors. Initial production year: 2018. Comfort and balance define the wearing experience, making it an easy daily companion. Subtle transitions between textures elevate the overall impression. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.