1919 2c carmine rose, used on flown cover from Barranquilla to Puerto Colombia, cover with hinge stains and slightly reduced at left, stamp v.f., signed A.Diena, cat. $1500 (Cat No. C1) (Image)

Cat. $1500, Est.US$500

1919 2c carmine rose, variety numeral "1" of "18" with serifs, used on flown cover from Barranquilla to Puerto Colombia, filing fold away from the stamp, fine and very rare, only 20 (!) printed, with 2001 Alex Rendon certificate, cat. $4500 (Cat No. C1a) (Image)

Cat. $4500, Est.US$3,000

1920 10c Condor on Cliff, margin clipped at left as usual, used on cover (somewhat reduced at bottom and at left) dated 22 February, cancelled by CCNA/Cartagena, up franked at single rate with National Post 1c and 2c, both tied by "Correo Aereo/Cartagena-Colombia" special cds, Recibo datestamp of Barranquilla on back, slight bend in center at top, fine and rare usage, only six covers recorded with this franking, cat. $5000 (Cat No. C8) (Image)

Cat. $5000, Est.US$3,000

1920 (October) Lithographed by Valiente, Barranquilla, issued but not used, 10c green, 10c vermilion, vertical se-tenant pairs, also four additional copies of 10c red, written-up on album page, with positions of the sheet indicated, v.f. (San.12-16) (Cat No. YT PA10-13) (Image)

Est.US$250

1921 "Vaolr 10 Centavos" on 50c pale green, used on piece in combination with regular 3c stamp, fine, with 2000 PFC, cat. $825 (Cat No. C19) (Image)

Cat. $825, Est.US$250

1921 surcharged "Vaolr 10 Centavos" on 50c, canceled "Sociedad Colombo-Alemana Correos Aereos" in green and used in combination with 3c regular franking on cover from Girardot to Neiva, with arrival hs, fine (Cat No. C19) (Image)

Est.US$500

1921 Surcharged "Valor 30 Centavos" on 50c green, vertical pair, bottom stamp with double surcharge, some natural gum creases at top, otherwise fine, signed Brun, Alex Rendon (catalogued as two normal stamps) cat. $1850 (Cat No. C20,20var) (Image)

Cat. $1850, Est.US$1,000

1921 Surcharged in black "Valor 30 Centavos" on 50c green, double surcharge, used with additional 3c National franking on cover from Medellin, November 7, 1921 to Tampa, Fla, tied by "Sociedad Colombo Alemana de Transportes Aereos Medellin", roughly opened at right, otherwise fine (Cat No. C20var) (Image)

Est.US$1,000

1921 handstamped "$0 30c" on 50c green, used with 3c government franking on cover from the Colombian National Railway Company in Girardot to Scadta Company in Barranquilla, 3 November 1921 departure datestamp, filing folds and some toning, otherwise fine, signed Alex Rendon, ex-Debbie Friedman (Cat No. C24) (Image)

Est.US$1,000

1921 Typewritten "Valor $0.10" in red on 50c green, tied by "Navegacion Aerea Neiva" and faint oval "Sociedad Colombo Alemana Correos Aereos Girardot" (repeated on back) on cover, used with government franking to Bogota, with government franking canceled by November 16, 1921 arrival datestamps, fine, signed Kessler, Alex West, cat. $1000 (Cat No. C24C) (Image)

Cat. $1000, Est.US$500

1923 (June 4) Issue, 1peso gray, double impression, used on large coverfront, perf. defects, otherwise v.f., ex-Rothschild (Cat No. San.85d) (Image)

Est.US$150

1928 4c stationery entire additionally franked with 4c and used from "Paipa" to the Scadta Office in Bogota, additionally franked on reverse with pair of 6c red (Correos Extra Rapidos) and tied by boxed "Compania de Transportes Terrestries" in blue, fine and scarce usage (Image)

Est.US$250