The Nomos Tetra Die Unerreichbare 427 is a square-shaped mechanical watch featuring a 29.5 mm stainless steel case with a height of 6.5 mm. It has a silver sunburst dial with a rose-colored small seconds sub-dial. The watch is powered by the in-house manual winding Alpha caliber, offering a power reserve of approximately 43 hours. It comes with a vegan velour remborde velvet gray strap and is water-resistant up to 30 meters. Reference number: 427.