1920 Curtiss full colour publicity label featuring "pilot in flight signaling biplane" with imprint below, this is the label that was surcharged to create the 1920 Compania Colombiana de Navegacion Aerea (CCNA) 10c multicolour stamp of which an example is included (signes Sanabria), the unsurcharged label with cert. Moorhouse, rare duo (Image 1)(Image 2)(Image 3)(Image)