Experience the craft of Fortis in the Cosmonaut (ref. 638.18.31), an elegant watch engineered for daily versatility and long-term reliability. From profile to crystal, the architecture convinces: crafted in stainless steel and measuring 42 mm in diameter, with a thickness of 15.5 mm, defined by a round silhouette, paired with a rotating, 0-60 (dive) bezel, protected by pvd coating. The caseback is closed, and the crystal is sapphire, delivering water resistance to 20000 meters. Up close, the dial rewards inspection: a black tone, framed by arabic numerals hour markers, and stick hands. Inside, precision takes center stage: the 7750 caliber. Designed for real-world wear, the watch transitions smoothly from tailored looks to casual settings. Manufacturing tolerances and surface treatment highlight consistent quality control. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.