Bubble Sextant MK IX. Brown bakelite box. The leather carrying strap is present. The closing hooks are present. Label marked 6B/151 Bubble Sextant MK IW Serial No 3953/40. Relatively soft grey foam lined interior. Photocopy of instructions for use. Metal instrument. All moving parts are functional. AM markings under crown. Bubble Sextant Mark IX H Hugues & Son Ltd London Ref 6B/151. Some wear and patina. This instrument was intended for use on bombers. Condition II+. Bubble Sextant Mk IX Brown bakelite case with leather carrying strap present. Closure hooks intact. Label marked 6B/151 Bubble Sextant Mk IX Serial No 3953/40. Interior lined with grey foam, still relatively supple. Photocopy of operating instructions included. Metal instrument with all moving parts functional. Marked with Air Ministry crown, Bubble Sextant Mark IX H Hughes & Son Ltd London Ref 6B/151. Showing expected wear and patina. This instrument was designed for aircraft use to determine the altitude of the sun or other celestial bodies and was carried aboard all multi-crew wartime aircraft, including bombers. Condition II+.