Sinn Watch 105 St Sa Leather 105.010 COWHIDE ORANGE STITCH. The ultimate Sinn sports watch, the Sinn 105 St Sa watch brings to life a remarkable range of functions perfect for the modern-day man who requires only the best in performance, precision and aesthetic. It’s uncompromising style includes a multifunctional bidirectional rotating bezel with minute ratcheting and luminous key mark which can be used for a variety of activities such as measuring elapsed time or setting up a second-time zone by using the 12 hour scale. Incorporating Sinn’s legendary TEGIMENT technology, the bezel of the Sinn 105 St Sa watch is engineered with a black hard coating for optimal scratch resistance while the 41mm stainless steel case is equipped with a screw down crown and case back to provide a water resistant rating of 200 metres. Housed within is the SW 220-1 self-winding mechanism, a Swiss made calibre which provides central hands for hours, minutes and seconds, a double day and date window at 6 o’clock and a power reserve of 38 hours. Each of these functions are displayed on a classic black matte dial with sporty orange accents protected by sapphire crystal glass with an anti-reflective treatment, the same material also found on the exhibition case back.