Philately. Compania Colombiana de Navegacion Aerea; Yv.14, Mi.10 I + II, vertical pair of airmail stamps 10c green; both types; very fine, issued without gum, c.v.. Yvert only as single stamps 460EUR (Image 1)(Image 2)
Philately. Compania Colombiana de Navegacion Aerea, Yv.15+ 16, Mi.15+16 II, vertical pair of airmail stamps 10c dark carmine; very fine, issued without gum, c.v.. Yvert 570EUR (Image 1)(Image 2)