COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 1, exceptionally well-centered, tied b (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 2, well-centered, tied by two strikes (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 3, perfectly centered, cancelled by ta (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 4, perfect centering with wide margins (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post, Numeral "1" with Serif (C1a). Position 5, tied by Ba (Image)

E. $ 2,000-3,000

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 6, tied by two strikes of Barranquilla (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 7, wide margins and well-centered, tie (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 8, perfectly centered with wide margin (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 9, well-centered, tied by two strikes (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 10, tied by Barranquilla Jun. 18, 1919 (Image)

E. $ 1,000-1,500

COLOMBIA, 1920, 10c "SCADTA", Clouds and Small Biplane at Top (C3). Large to full margins, ti (Image)

$ 1,750.00

COLOMBIA, 1920, 10c "SCADTA", Tilted Plane Viewed Close-Up from Above (C4). Large margins, ti (Image)

$ 1,750.00

COLOMBIA, 1920, 10c "SCADTA", Flier in Plane Watching Biplane (C5). Without gum as issued, mo (Image)

$ 4,500.00

COLOMBIA, 1920, 10c "SCADTA", Condor on Cliff (C8). Without gum as issued, three large margin (Image)

$ 8,000.00

COLOMBIA, 1920, 10c "SCADTA", Plane at Rest and Pilot Foreground (C9). Without gum as issued, (Image)

$ 4,500.00

COLOMBIA, 1920, 10c "SCADTA", Ocean Liner (C10). Used with National 3c and tied by violet Car (Image)

E. $ 400-500

COLOMBIA, 1920, 10c Green, Air Post - March 6, 1920, Third Flight (C11; Sanabria 11). Two exa (Image)

E. $ 1,500-2,000

COLOMBIA, 1920, 10c Green, Air Post - March 6, 1920, Third Flight (C11; Sanabria 11). Large m (Image)

E. $ 300-400

COLOMBIA, 1920, 10c Green, Air Post - March 11, 1920 Flight (C11; Sanabria 11). Two, each wit (Image)

E. $ 1,000-1,500

COLOMBIA, 1920, 10c Green, Air Post - March 11, 1920 Flight (C11; Sanabria 11). Large margins (Image)

E. $ 1,000-1,500

COLOMBIA, 1920, 10c Green, Air Post - June 22, 1920 Flight (C11; Sanabria 11). Large margins (Image)

E. $ 1,500-2,000

COLOMBIA, 1920, 10c Green, Air Post - July 7, 1920 Flight (C11; Sanabria 11). Large margins t (Image)

E. $ 1,000-1,500

COLOMBIA, 1920, 10c Red Brown, Air Post - April 16, 1922 Flight (C11C; Sanabria 16). Used wit (Image)

E. $ 500-750

COLOMBIA, 1920 CCNA Second thru Fourth Issues Group (C11-C11D; Sanabria 11-16A). Various unus (Image)

$ 4,630.00

COLOMBIA, 1920, "-30 cvs-" on 10c Black on Yellowish, Air Post Essay Surcharge. Two, one each (Image)

E. $ 750-1,000