Limited Edition of 856 Pieces Sinn Watch 856 B-Uhr Limited Edition Cowhide Leather. 856.012 Cowhide Leather.  Sinn watches are renowned for their nautical and aviation themed designs, and this Sinn 856 B-Uhr Limited Edition Leather watch continues this tradition by celebrating the first deck watches developed by John Harrison in the 18th century that were eventually used in the military for locating, navigation and keeping to schedule. The bead blasted stainless steel case, which boasts especially scratch resistant TEGIMENT technology, hides the SW300-1 self winding movement with 200 metre water resistance and air dehumidifying technology which enhances functional reliability and freedom from fogging.  Housed beneath the scratch resistant sapphire crystal glass with antireflective treatment is a matte black dial which features, like most Sinn watches, numerals, indices and hands coated in luminescent colour for optimal visibility even at night. The timepiece is completed by a black cowhide leather strap with a matching removable underlay and a pin buckle for effortless wear and comfort. This Sinn 856 watch is limited to only 856 pieces, cleverly referencing the model, and we don’t expect these numbers to last long.