Periscopic aircraft sextant: Type 1A, No. 2053, with mount; mahogany case; steel case; cardboard box upper+lower; outside box

Periscopic bubble aircraft sextant, Type 1A, No. 2053; Mount for periscopic bubble aircraft sextant; Mahogany carrying case, for periscopic bubble aircraft sextant; Steel carrying case, pyramidal shaped, for periscopic bubble aircraft sextant; Cardboard box, internally padded to fit lower half of steel carrying case; Cardboard box, internally padded to fit upper half of steel carrying case; Cardboard box – inscribed with: ‘Comet Sextant’ - to fit over lower and upper internally padded cardboard boxes: all objects by Kelvin and Hughes (Aviation) Limited, Barkingside, Essex, England, 1950-1951. The periscopic bubble aircraft sextant was used on the De-Havilland Comet passenger jet aircraft.