Canal Zone, 1924, 50¢ Lilac, Flat "A", well centered, tied by "Balboa Heights, C.Z. Jan 12, 1926" cds on registered airmail cover to Columbus, Ohio, "Received too late for Overnight Air Service, Forwarded by rail." label affixed, Philadelphia (1.19) and Columbus (1.20, 1.21) backstamps; reduced slightly at right, Very Fine, A rare use of the 1924 50¢ issue, of which only a handful are known. Scott No. 80  Estimate $300 - 400. $0 (Image)