Cover franked with 1932 5c brown and 20c bronze green & carmine AIR issue (SG 431 & 439) tied by MEDELLIN cds's dated 3 VII 1933. Flown on the UMCA flight from Medellin to Turbo with large red circular 'PRIMER CORREO AEREO MEDELLIN - URABA UMCA MEDELLIN JULIO 3 1933' airplane cachet on front and signed on front by the pilots W S Doxey and W W Lynch. Addressed to TURBO with arrival cds on reverse. Very scarce flight. (Muller #83)