Printed 'AVIANCA' airmail cover franked with 1945 15c carmine, 1947 5c red, green, yellow & brown and 1945 1c violet TAX issue (SG 624, 659 & 613) tied by CORREO AEREO TECHO BOGOTA cancels in blue dated APR 21 1948. Addressed internally to CALI with partial arrival cds on reverse.