Sinn, a German watchmaker, began in 1961 by Helmut Sinn, initially producing navigation clocks. They gained prominence for durable, functional timepieces used by pilots, divers, and astronauts. In the ’90s, Lothar Schmidt acquired the brand, enhancing its technological innovations, like the use of submarine steel and DIAPAL technology for oil-free movements. Their collections expanded, offering robust chronographs, mission timers, and specialized instruments, all known for reliability in extreme conditions. Sinn continues to merge precision engineering with practicality, earning a reputation for high-quality, purpose-built watches revered by professionals and enthusiasts alike.