Cardboard box, to fit over internally padded cardboard boxes, for periscopic bubble aircraft sextant

Cardboard box – inscribed with: ‘Comet Sextant’ - to fit over upper and lower internally padded cardboard boxes, for periscopic bubble aircraft sextant, Type 1A, No. 2053, by Kelvin and Hughes (Aviation) Limited, Barkingside, Essex, England, 1950-1951