COLOMBIA, 1923, 30c Blue, Air Post (C42).
Used with National 3c and tied by Barranquilla Aug. 10, 1923 double-circle datestamp on first flight
cover to Balboa Heights, Canal Zone,
violet "Primer Correo Aereo, Colombia-America Central" boxed handstamp, Cristobal and Ancon transit backstamps, interesting SCADTA label sealing cover, Very Fine and rare, few covers were carried on this survey flight using Dornier Wal flying boat
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