Originally Introduced In 1940, The BENRUS Sky-Chief Was Developed As A Purpose-Built Pilot's Chronograph For Cockpit Precision. Featuring A Distinctive Domed Crystal And Slim Bezel That Created A Porthole Effect, It Offered Exceptional Legibility In Flight. Its Tri-Compax Layout And Aeronautical Minute Graduation Allowed Pilots To Perform Accurate Navigation And Cruise Calculations.