Meet IWC Portugieser (ref. IW5901-10), a distinctive model that balances proportion, precision, and presence. On the wrist, the case feels purposeful: crafted in platinum and measuring 46 mm in diameter, with a thickness of 13.4 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 green tone with sunburst finish, framed by arabic numerals hour markers, and feuille hands. Mechanically, the watch prioritizes accuracy: the 94800 caliber. Released in a constrained run, appealing to focused collectors. Initial production year: 20192020. 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.