1939 Imperial Airways Second Survey Flight cover, from Seabright, N.J.
via Botwood, Newfoundland, Foynes, Ireland and Marsailles, France
addressed to the Captain of the aircraft, Patrick J. Byrne
and signed by him and the five other officers on board.
Murphy "Irish Airmail 1919-1990" says only 5 recorded.
6d value from set of overprinted Specimen of Airmail stamps
in right marginal blocks of four.