Headed 'Sociedad Colombo-Alemana de Transportes Aereos (SCADTA)' official envelope franked with single 1923 4c blue (SG 395) tied by BARRANQUILLA cds with fine strike of 'OF CORREO AEREO BARRANQUILLA' official SCADTA frank (indicating that the airmail postage was paid). Addressed to BOGOTA with arrival mark on reverse. Very Scarce.