FIRST EMPIRE FLYING BOAT 1½d rate, SOUTH AFRICA to EGYPT postal history 1937 cover with Claremont sender address on reverse marked "First Empire Flying Boat 1½d rate" to Cairo, Egypt with 1½d tied Cape Town JUL 3 1937 machine, on arrival framed "RETOUR" and pencil "to sender", on reverse boxed "UNCLAIMED/NON RECLAME" handstamp, some toning. £24