1910 Independence Centenary, complete set of eight, each stamp with security punch and overprinted Specimen in red, n.h., rare (Cat No. 331-38S) (Image)

Est.$200

1920 10c Tilted plane viewed close-up from above, unused without gum as issued, h.r., large margins and bright colors and fresh, minute thin spot as often, still v.f. Only 31 unused examples recorded, cat. $4500 (Cat No. C4) (Image)

Cat. $4500, Est.$1,500

1920 10c Lighthouse, unused without gum as issued, h.r., large margins all around, rich colors, tiny toned speck on back of left margin, fresh and v.f. stamp. Only 50 unused examples have been recorded, cat. $3000 (Cat No. C6) (Image)

Cat. $3000, Est.$2,000

1920 10c Ocean Liner, tied by violet "Compania Colombiana de Navegacion Aerea Agencia de Cartagena" oval, used in combination with 3c brown on cover from Cartagena (22 Feb) to Barranquilla, additional departure pmk alongside, v.f., with 23 February arrival pmk on back, signed Field, with 1999 Philatelic Foundation certificate, cat. $2000 (Cat No. C10) (Image)

Cat. $2000, Est.$1,500

1930 (24 Feb) flown cover from Cali, via Cristobal (Canal Zone) and Panama to Buenos Aires, attractively franked with Colombian stamps used in combination with Canal Zone 20c surcharge, with transit and arrival pmks (Image)

Est.$250

1931 (5 May) Leningrad-Berlin and on to Colombia, flown 4c stationery entire, with Russian and Colombian adhesives added in Buenaventura (25 May) to pay local charges for delivery to final destination, Cali (28 May) v.f. (Image)

Est.$150