COLOMBIA, Consular Mail - Panama, 1921, 30c Green, Third SCADTA Issue (C29).
Tied by well-struck violet "Servicio Postal Aereo de Colombia, Panama" circular handstamp, used with National 3c and cancelled upon arrival on cover front only to Bogota, Fine and rare with such a clear strike, only a small handful of covers with this experimental handstamp are known, used prior to the introduction of the Consular overprinted stamps, with 2007 Colomphil certificate
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