Philately. Compania Colombiana de Navegacion Aerea, Yvert 14, Mi.10 I + II, 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) (Image)

Philately. Compania Colombiana de Navegacion Aerea, Mi.15+16, combined pair of airmail stamps 10C brown-red; very fine, issued without gum, cat. Michel only as single stamps 170EUR (Image 1) (Image 2) (Image)