1963 2/6D CASTLE USAGE UNDELIVERED MAIL LONDON TO USA. Envelope, 210 x 140mm, faults at top, with 2/6d Castle sent air mail London to USA cancelled 'LONDON' 18 JLY 1963 with various instructional's 'NO SUCH STREET NUMBER' and 'UNDELIVERED FOR REASON STATED/RETURN TO SENDER'. Light bend affects stamp, unusual usage. (Ref 100323).
