Airmail cover franked with 1937 10c scarlet, 3 x 1948 20c brown & 5c grey TAX issue plus 1950 30c green AIR issue with large 'L' overprint of LANSA plus 1950 2 x 1p brown red & orange AIR issue with small 'A' overprint of AVIANCA (SG 488, 689, 708, 14 & 18) all tied by BOGOTA cds's with boxed registration marking on reverse. Addressed to UK with various other transit marks on reverse. Most probably flown by Avianca.