1920, Compania Colombiana de Navegacion Aerea, 10c light brown red, vertical se-tenant pair of two different designs, no gum as produced, VF and scarce, only 408 stamps were produced of each design, F. Kessler guarantee hs on reverse
1926-27, printed matter mixed franking cover from Hamburg to Bogota, franked by German 25pf blue and Colombian 15c carmine with "A" overprint, upon surface arrival to Colombia posted to Flight "Barranquilla - Girardot", all appropriate markings, mounted on page from a Collection, VF
Click here to see the backside of the cover