1920 10c "Clouds and Biplane", canceled on 22 February cover of the First Flight from Cartagena to Barranquilla, tied by C.C.N.A. oval datestamp on departure, with National Post 3c alongside tied by "Correo Aereo./Cartagena-Colombia." cds, usual horizontal filing crease away from the stamp, minor toned specks, otherwise v.f., one of the finest of just 11 covers known from this flight, Bortfeldt certificate (Cat No. C3) (Image)

Est.US$2,500

1921 "Vaolr 10 Centavos" on 50c pale green, featuring "Vaolr" variety, used on cover to Neiva (Behr-Heyder mail), tied by Scadta double oval handstamp of Girardot, additionally franked with 1/2c (2) and 2c tied by Scadta double oval of Girardot, paying the national postage, tied by Neiva duplex datestamp, v.f., with Diena certificate. One of nine covers recorded (Colomphil 4) (Cat No. C19var) (Image)

Est.US$500

1921 "Valor 30 Centavos" on 50c pale green, canceled by Scadta oval handstamp of Cartagena on commercial cover to Medellin, additionally franked for postage with 3c, both adhesives tied by 16 December framed datestamp on arrival, horizontal filing fold away from the stamps (Colomphil 20) (Cat No. C20) (Image)

Est.US$500

1921 "VALOR 30 CENTAVOS" on 50c pale green, type 21, not showing the usual paper folds for this type, applied on Behr-Heyder envelope to Bogota, canceled by Scadta three-line and "El Agente/Manuel Jose Tobon" two-line handstamps of Medellin, with National Post 1/2c (4) and 1c tied by 10 November datestamp, also on dispatch (Colomphil 21) (Cat No. C20) (Image)

Est.US$500

1921 "VALOR $0.10", red typewritten surcharge on marginal 50c pale green, used on Behr-Heyder envelope to Bogota, tied at Neiva and Girardot by Scadta Agency cancels, and postage paid with 1/2c pair and 2c cancelled by receiving postmark dated 16 November. Only nine covers recorded (Colomphil 5) cat. $2000 (Cat No. C24A) (Image)

Cat. $2000, Est.US$750

1921 "VALOR $0.10", violet typewritten surcharge on 50c pale green, vertical strip of three overpaying a Behr-Heyder envelope addressed to Bogota, each canceled by Scadta three-line of Medellin and "El Agente/Manuel Jose Tobon" two-line handstamps in violet, with postage being paid by 1/2c pair and 2c, tied by 10 November framed datestamp on dispatch (Colomphil 5) (catalogued as three used singles) cat. $4500 (Cat No. C24A) (Image)

Cat. $4500, Est.US$1,000