Lot 1072
Black machine overprints on 1923 issue: Switzerland, 30c. blue in combination with Switzerland 30rp. blue, tied by cds. "SERVICEO DE TRANSPORTES AEREO BARRANQUILLA 28.III.1927" resp. "ZÜRICH 2.III.27" to cover to Bogota, with red straight-line "APARTADO" alongside and Agency cachet on reverse, little roughly openend at left, slight vertical fold, otherwise fine
