COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 1, slightly dried original gum, h.r., (Image)

E. $ 750-1,000

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 2, minor h.r., well-centered, couple t (Image)

E. $ 750-1,000

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

E. $ 500-750

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 3, large part original gum, full perfs (Image)

E. $ 1,000-1,500

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 4, small h.r., remarkably well-centere (Image)

E. $ 2,000-3,000

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

E. $ 2,000-3,000

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

E. $ 1,500-2,000

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 7, traces of dried original gum, well- (Image)

E. $ 750-1,000

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 8, traces of dried original gum, excel (Image)

E. $ 750-1,000

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 9, original gum, well-centered, rich c (Image)

E. $ 1,500-2,000

COLOMBIA, 1919, 2c Knox Martin Air Post (C1). Position 10, original gum (certificate notes "s (Image)

E. $ 750-1,000

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

E. $ 500-750

COLOMBIA, 1920, 10c "SCADTA", Women and Boy Watching Plane - Outbound Flight (C2). Large to f (Image)

E. $ 500-750

COLOMBIA, 1920, 10c "SCADTA", Clouds and Small Biplane at Top - Outbound Flight (C3). Large t (Image)

E. $ 1,000-1,500

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

E. $ 750-1,000

COLOMBIA, 1920, 10c "SCADTA", Flier in Plane Watching Biplane - Outbound Flight (C5). Large m (Image)

E. $ 2,000-3,000

COLOMBIA, 1920, 10c "SCADTA", Fuselage and Tail of Biplane - Outbound Flight (C7). Large to f (Image)

E. $ 1,500-2,000

COLOMBIA, 1920, 10c "SCADTA", Fuselage and Tail of Biplane - Outbound Flight (C7). Large to a (Image)

E. $ 2,000-3,000

COLOMBIA, 1920, 10c "SCADTA", Condor on Cliff, Without Surcharge - Outbound Flight (C8 var). (Image)

E. $ 35,000-45,000

COLOMBIA, 1920, 10c "SCADTA", Condor on Cliff - Outbound Flight (C8). Large margins to just t (Image)

E. $ 2,000-3,000

COLOMBIA, 1920, 10c "SCADTA", Plane at Rest - Outbound Flight (C9). Large balanced margins, t (Image)

E. $ 1,000-1,500

COLOMBIA, 1920, 10c "SCADTA", Ocean Liner - Outbound Flight (C10). Large to full margins, tie (Image)

E. $ 750-1,000

COLOMBIA, 1920, 10c "SCADTA", Tilted Plane Viewed Close-Up from Above - Post-March 4 Flight (C4). (Image)

E. $ 3,000-4,000

COLOMBIA, 1920, 10c "SCADTA", Women and Boy Watching Plane - Post-March 4 Flight (C2). Large (Image)

E. $ 3,000-4,000