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Amgueddfa Cymru – Museum Wales
Full title - First Flight Great Western Railway Air Service South Wales to Devon 12th April 1933. Commemorative envelope of the first flight of G.W.R. Air Service. Green G.W.R. 3d newspaper parcel stamp with postmark of G.W.R. Cardiff (General) Station and brown standard 1½d stamp of George V with postmark of Plymouth Post Office 12.30pm April 12 1933.