Sinn watch 857 s utc vintage leather 857020 vintage leather sinn watches are renowned for their aviation inspired designs and this sinn 857 s utc watch continues this tradition by bringing to life an aesthetic reminiscent of cockpit navigation clocks and their rapid and clear readability the black hard coated 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 techno