Discover Swatch's precision with the Sistem 51 (ref. SUTG400), a distinctive model that balances proportion, precision, and presence. On the wrist, the case feels purposeful: crafted in plastic and measuring 42 mm in diameter, with a thickness of 13.8 mm, defined by a round silhouette. The caseback is open, and the crystal is plexi, delivering water resistance to 3000 meters. Visually, the face is where character emerges: a green tone, framed by stick / dot hour markers, and stick hands. Mechanically, the watch prioritizes accuracy: the Sistem51 caliber. First released in 2015. 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.