Sinn

Sinn U1 SDR, a full set from 2011, one of Sinn’s most iconic and rugged dive watches. Built from German submarine steel and featuring the signature black captive diver’s bezel, the U1 SDR is engineered for extreme durability, corrosion resistance, and professional-grade performance. This example shows heavy signs of use throughout, consistent with a watch designed for real-world duty. The AR coating is worn, which is common on older Sinn models and can be polished off entirely if the new owner prefers a clean crystal appearance. Despite the cosmetic wear, the watch remains mechanically strong — a testament to Sinn’s tool-watch construction. Powered by the reliable Sellita SW200-1 automatic movement, the U1 SDR offers a 38-hour power reserve, outstanding legibility, and an impressive 1000m water resistance. Every watch we sell is 100% authentic guaranteed and in working condition. The watches are checked upon arrival and tested for accuracy.