Cover franked with 1920 3c red on yellow National issue (SG 380) uncancelled and 1920 10c green 'Pilot signalling biplane' issue printed from the Curtis design by Valiente (SG 10) tied by undated oval CIA DE NAVIGACION AEREA AGENCIA BARRANQUILLA cancel and also by four line 'PRIMER CORREO AEREO DIRECCION DE BARRANQUILLA A MEDELLIN BARRANQUILLA _______' cachet, both in purple. Addressed to MEDELLIN. A fine & rare cover.