1920 10c "Woman and Boy Watching Plane", unused without gum as issued, n.h., large balanced margins all around, beautiful colors, fresh, tiny natural inclusion in the left margin (mentioned for accuracy's sake), v.f., signed Kessler, Sanabria, Herbert Bloch, etc., with 1971 Friedl and 1998 Diena certificates. Only 38 unused examples have been recorded (Compania Colombiana de Navegacion Aerea was founded September 28, 1919. In February 1920, the C.C.N.A. obtained a franchise to fly between Cartagena and Barranquilla and was authorized to issue its own stamps. This was facilitated by overprinting Compania Colombiana de Navegacion Aerea Porte Aereo and surcharging $ 0.10 on the Curtiss Aereo Plane & Motor Co. advertising labels. Less than 100 of each of the nine types were produced. These stamps were used on two first flights on February 22, 1920 from Cartagena and returning March 4 from Barranquilla. In July 1920, the air mail concession was passed to SCADTA. The C.C.N.A. ceased to operate in April, 1922) cat. $3000 (Cat No. C2) (Image)

Cat. $3000, Est.$2,000

1920 10c Woman and Boy Watching Plane, canceled on piece, violet CCNA postmark, margins all around, overall toning, otherwise fine and rare multicolored airmail vignette from Colombia, actually used in the mail (only 100 printed), cat. $1875 (Cat No. C2) (Image)

Cat. $1875, Est.$1,000

1920 10c Clouds and Small Biplane at Top, unused without gum as issued, large margins all around, rich colors, fresh and v.f., signed Herbert Bloch. A difficult stamp in sound condition, only 27 unused examples have been recorded, cat. $3800 (Cat No. C3) (Image)

Cat. $3800, Est.$2,500

1920 10c Flier in Plane Watching Biplane, unused without gum as issued, large margins all around, rich colors, fresh and v.f., signed Herbert Bloch, with 1957 Friedl certificate. Only 53 unused examples have been recorded, cat. $3500 (Cat No. C5) (Image)

Cat. $3500, Est.$2,500

1920 10c Flier in Plane Watching Biplane, canceled on piece, large margins all around, overall toning, otherwise fine and rare multicolored airmail vignette actually used in the mails (only 100 printed), cat. $1875 (Cat No. C5) (Image)

Cat. $1875, Est.$1,000

1920 10c Lighthouse, unused without gum as issued, large margins all around, rich colors, fresh and v.f., signed Herbert Bloch, etc., with 1998 Diena certificate. Only 50 unused examples have been recorded, cat. $3000 (Cat No. C6) (Image)

Cat. $3000, Est.$2,000

1920 surcharged in manuscript "30" over "0,10", unused without gum as issued, slight bends, otherwise v.f., signed Diena, with 2009 Brian Moorhouse certificate. A rarity, only a few recorded (Cat No. C6var) (Image)

Est.$7,500

1920 10c Fuselage and Tail of Biplane, unused without gum as issued, large margins all around, including roulette lines at left, fresh and v.f., signed Diena, with his 1998 certificate. This is the key CCNA multicolor vignette, only 15 unused examples have been recorded (most have small defects). A major Colombia and Air Post rarity (a comparable, but slightly defective example fetched $12,390 including buyer's premium at Barry Fletcher's sale of Colombia in 2018) cat. $11000 (Cat No. C7) (Image)

Cat. $11000, Est.$7,500

1920 10c Condor on Cliff, unused without gum as issued, large margins all around, bright colors, v.f., pencil signed and rare. Only 36 unused examples have been recorded (virtually all known copies are cut in at left), cat. $6000 (Cat No. C8) (Image)

Cat. $6000, Est.$5,000

1920 10c Plane at Rest, unused without gum as issued, large margins all around, typical plate crack and blue ink printed at lower left, v.f., signed Herbert Bloch, with 1977 APS certificate. A rare unused stamp, only 41 examples recorded, ex-Brigitte Kaplan, cat. $3500 (Cat No. C9) (Image)

Cat. $3500, Est.$2,500

1920 10c Plane at Rest, used on piece, large margins all around, violet CCNA pmk, overall toning, otherwise v.f. and rare multicolored airmail from Colombia, actually used in the mails (only 100 printed), cat. $1875 (Cat No. C9) (Image)

Cat. $1875, Est.$1,000

1920 10c Ocean Liner, unused without gum as issued, large, even margins all around, fresh and v.f., signed Roumet, Alex Rendon, with his 1986, also 1998 Diena certificates. Most of the issued stamps have been used on covers, only 24 unused examples recorded, cat. $4600 (Cat No. C10) (Image)

Cat. $4600, Est.$3,500

1920 10c Brown Red, second setting sheet of 68 (6x10, plus eight printed sideways), with tete-beche and showing the "Cvalientem Lit." imprint at bottom left, showing re-engraved mountains on pos. 23; also 10c green sheet of 72 (6x12), both unused without gum as issued, large margins, fine-v.f., scarce sheets (Image)

Est.$2,500

1920 10c green, used with additional franking on first flight cover from Barranquilla to Medellin, some toning, otherwise fine (Cat No. C11) (Image)

Est.$250

1920 10c green, used in combination with 3c government franking on coverfront to Medellin, first flight cachets of Barranquilla and boxed 16 April 1922 arrival datestamp, signed on back, little toning, otherwise fine, rare (Cat No. C11) (Image)

Est.$500

1923 30c ultramarine, with "I" (Italy) double, h.r., v.f., signed Kessler, Holcombe, etc. (Image)

Est.$250