KV)1971 COLOMBIA, FIRST FLIGHT OF AVIANCA FROM BARRANQUILLA TO ZURICH, WITH A 50 CENTAVOS AVIANCA ST

KV)1971 COLOMBIA, FIRST FLIGHT OF AVIANCA FROM BARRANQUILLA TO ZURICH, WITH A 50 CENTAVOS AVIANCA STAMP AND A COLOMBIAN STAMP SHOWING AN AIRPLANE WITH A 3.50 PESOS STAMP.