22nd December cover franked 1923 4c blue (SG 395) and SCADTA 1929 20c red (SG 59) both tied by blue BUGA cds's flown on the BUGA - BOGOTA first flight with 'Primer Correo Aereo Buga - Bogota' cachet and arrival cds on reverse. (Muller #64a, Only 200 covers flown)