From MB&F, presenting the Horological Machines (ref. 40.TSL.B), a contemporary classic shaped by careful watchmaking know-how. The exterior is thoughtfully executed: 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. At a glance, the dial balances texture and clarity: a black tone, framed by arabic numerals hour markers, and proprietary hands. At its heart beats a proven engine: the HM4 caliber. Initial production year: 2013. With considered ergonomics, it feels composed during extended wear. Brushed and polished elements play with light to emphasize crisp geometry. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.