RAF Flight Instruments. Consisting of a Longines Witthauer aircraft watch. A counter marked Knots, 1931 KDG/R/9/5C 20. A metal flight instrument, marked Oxygene regulator 6D/1286. An MK II/A oil meter. A metal and bakelite calculator, marked 10A/12913. Some wear and patina. Condition II+. RAF cockpit instruments Comprising one cockpit clock manufactured by Longines Wittnauer. One gauge marked Knots, reference 1931 KDG/R/9/5C 20. One metal cockpit instrument marked Oxygen Regulator 6D/1286. One oil gauge Mk II/A. One metal and bakelite calculator marked 10A/12913. Showing expected wear and patina. Condition II+.