Colombia . 1920, 10c SCADTA, Woman & Boy Watching Plane,. used, tied to piece by violet special cancel, unusual variety with overprint slightly slanted diagonally, light overall toning typical of used examples due to stamps being issued without gum and needing to be glued to envelopes, good margins, fine and scarce. (Sc. C2, $1,750). Used (Image1)

Est. US$750-1,000

Colombia . 1920, 10c SCADTA, Flier in Plane Watching Biplane,. used, tied to piece by violet special cancel, balanced margins, typical overall toning found on used examples, else very fine. (Sc. C5, $1,750). Used (Image1)

Est. US$750-1,000

Colombia . 1920, 10c SCADTA, Flier in Plane Watching Biplane,. from the Curtiss Co. publicity label sheet, bright color, upper left corner wrinkle and a few tone spots on back, else very fine. (Sc. C5var). Mint H (Image1)

Est. US$100-150

Colombia . 1920, 10c SCADTA, Plane at Rest,. used, tied to piece by violet special cancel, large even margins, typical overall toning found on used examples, else scarce and very fine. (Sc. C9, $1,750). Used (Image1)

Est. US$750-1,000

Colombia . 1932, 5c yellow orange to 5p olive green Air Post,. overprinted CORREO AEREO in black, set of thirteen, hinged, bright color, well-centered, chiefly very fine. (Sc. C83-95, $303). Mint H (Image1)

Est. US$75-100