Sinn Watch 856 S Leather. 856.023 Leather This extraordinary Sinn 856 S watch proves the brand’s expertise in crafting wear resistant pilot watches equipped with exceptional functionality for any aviation adventure. Presented in the form of a 40mm black coated stainless steel case, this Sinn 856 is engineered using the brand’s famous TEGIMENT technology. This fantastic technique ensures that the case has a significantly greater level of protection against scratches than normal stainless steel. Hidden within the case of this Sinn 856 S watch is the SW300-1 automatic winding movement which provides hour, minute and seconds function and a date display at 4 o clock. Each of these impressive functions are laid out on a matte black dial with the numerals, indices and hands coated in luminescent colour for easy legibility in low light. In typical Sinn fashion, the German pilot watch is filled to the brim with incredible innovations including Ar-Dehumidifying Technology to enhance functional reliability and ensure freedom from fogging and magnetic field protection up to 80,000 A/m. Last but not least, this Sinn 856 S watch is provided with a screw fastened case back, sapphire crystal glass and a screw down crown to ensure its water resistance of 200 metres alongside a luxurious black leather strap for a final touch of sophistication.