South Africa, 1929 Port Elizabeth, South Africa to Cali, Columbia, 1d red KGV entire uprated with 1926, 1d black & carmine, horizontal pair + Airmail 1929, 4d green, all tied by "Port Elizabeth, 17 Oct. 29" cds's, bilingual airmail etiquette at top left, carried by air from South Africa and then overland to Columbia where then carried by Scadta airmail, franked with Columbia Scadta Airmail 1929 30c gray blue (Scott C59) tied by "Servico De Transportes Aereos Cali, 26.XII.1929" cds, correspondence label and additional Cali box handstamp on reverse; slight cover soiling, Very Fine; with 2010 M. Eichele certificate. SG No. 31+40  Estimate $3,000 - 4,000. AN EXTREMELY RARE AND ALMOST CERTAINLY UNIQUE SOUTH AFRICA - SCADTA AIRMAIL COMBINATION USAGE. $0 (Image)