1920, Landscape and Airplane 15 c. blue, two single stamps tied by violet handstamp "SERVICIO POSTAL AEREO SCADTA BOGOTA" to reverse to cover with horizontal pair Columbia 1920 5 c. blue to Bremen, Germany with date mark from 20.4.1922 and violet Scadta advertising cachet on reverse, stamps with gum spots, otherwise fine (Image)

1920, Landscape with Airplaine 30 c. black on rose and 50 c. green, booth with signatur "G. Mejia", unused, fine, signed H.R.Harmers (Mi. 640,-) (Image)

30 c. rose tied by green oval "SOCIEDAD COLOMBO ALEMANA CORREOS AEROS GIRADOT" to cover with uncanelled Columbia 1920 3 c. green to Barranquilla with arrival mark (Image)

30 c. rose tied by three line handstamp "SOCIEDAD COLOMBO ALEMMMMANA DE TRANSPORTES AEREOS" to cover with Columbia 1921 Provisional $ 0,003 on 4 c. violett to Barraquilla, cover with slight creases, otherwise fine (Image)

3 s. on 60 c. brown, two single stamps and registered stamp 20 c. grey in combination with ten stamps Ecuador 5 c. brown, tied by black dated cachet "SERVICO DE TRANSPORTES AEREOS ECUADOR-COLUMBIA GUAYQUIL SCADTA 15.ENE.1929" to large registered cover via Barranquilla to Berlin with arrival mark, cover vertical fold, otherwise fine, scarce franking (Image)

50 c. green with surcharge in type III and overprint error "VAOLR instead of VALOR" and vertical stripe of three and single stamps Landscape and Airplaine 10 c. yellow, all tied by flight cancel "SERVICIO POSTAL AEREO SCADTA BOGOTA" to cover with additional franking horizontal pair Colombia 1920 3c. green to New York with date mark from 22.12.1921, cover and few stamps on reverse with creases, airmail stamp with surcharge error are fine, very rare  (Image)

1921, Second Issue Landscape and Airplane surcharged "VALOR 30 CENTAVOS", 50 c. green surcharge type II, two single stamps with diagonal pre-printing paper folds, tied by green oval "SOCIEDAD COLOMBO ALEMANA CORREOS AEROS GIRADOT" to registered cover with additional franking on both sides, all cancelled by violet handstamp "Republica de Colombia CORREOS NACIONALES NOV 25.1921 DESPACHO (Giradot) to Köln with arrival mark, few stamps and cover with small faults, otherwise fine, rare  (Image)

1923, Landscape and Buildings 1 p. grey tied by cds. "SERVICIO DE TRANSPORTES AEREOS BOGOTA 22.1.1929" to postal order to Puerto Wilches with arrival mark and revenue stamp on reverse, fine (Image)

1928, Friendship Flight to New York 20 c. and Landscape and Building 10 c. green, tied by cds. "SERVICEO DE TRANSPORTES AEREOS BOGOTA -11.II.1929" to Colombia postal stationery 4c. with additional franking to Kiel, creases, scarce (Image)

1930, Simón Bolivar issued 10-30 c. as uprated franking on cover from "CALI 17.XII.1930" via Cristobal and New York with Colombian and Canal Zone franking (one pair not cancelled) on both sides to Germany, fine (Image)

GENERAL FOREIGN COUNTRIES ISSUE: 1929, Numerals 5-15c. as uprating franking on Colombia 4 c. stationery envelope from Leningrad to Cali franked with five Russian adhesives, cancelled by large "Leningrad-Berlin Air Link" cachets to "Berlin 5.5.31 20-24" and Colombian national postage tied at "Barranquilla 25.V.1931" to "Cali 28.V.1931", bearing boxed "Buenaventura 26.MAY 1931" transit mark on revese., a fine flown combination cover (Image)

1929, Numerals 5 -15c. and registered stamp 20 c. red as uprated franking on Columbian 4 c. stationery envelope with additional franking Columbian 2 c. red and pair 1 c. green from "LAS PALMAS 9.MAR.31" via Madrid to Cali franked with horizontal pair Spain 40 c. blue and arrival mark "CALI 8.IV.31", fine, rare (Image)

30 c. blue in combination with Netherland 1/2 c. grey and pair 6 c. brown tied by cds. "ROTTERDAM 6.VIII.34" to cover via "BARRANQUILLA 23.VIII." to Meddelin, tiny stains spots, otherwise fine (Image)

ISSUES FPR ECUADOR: 1928, Provisional Overprint in red 75 c. red and additional franking Ecuador 1 c. blue and 5 c. brown tied by black dated cachet "SERVICO DE TRANSPORTES AEREOS ECUADOR-COLUMBIA GUAYQUIL SCADTA 22.ENE.1929" to cover via Barranquilla to Berlin, fine, scarce  (Image)

1 s. on 20 c. grey and additional franking Ecuador 10 c. green on reverse tied by black dated cachet "SERVICO DE TRANSPORTES AEREOS ECUADOR SCADTA MANTA 9.SET.28" to cover to Guayaquil with arrival mark and blue flight dated cachet on reverse, small part of flap missing, otherwise fine (Image)

1 1/2 s. on 30 c. blue and additional franking Ecuador 10 c. green tied by blue dated cachet "SERVICO DE TRANSPORTES AEREOS ECUADOR-COLUMBIA GUAYQUIL SCADTA 6.NOV.1928" to cover via Barranquilla to Colon with arrival mark, cover vertical fold, otherwise fine (Image)

1 1/2 s. on 20 c. blue and registered stamp 1 s. on 20 c. grey and additional franking Ecuador 10 c. green tied by blue dated cachet "SERVICO DE TRANSPORTES AEREOS ECUADOR-COLUMBIA GUAYQUIL SCADTA 28.AGO.1929" to registered cover to Bogota with arrival mark, some minor staining, otherwise fine, scarce (Image)

3 s. on 60 c. brown and additional franking Ecuador 20 c. green and 5 c. violet tied by cds. "GUYAQUIL 10.III.1929" to cover via Barranquilla to Altona, Germany, creases (Image)

30 c. blue, single stamp and horizontal strip of three and registered stamp 20 c. grey in Combination with German Empire 100 pfg. violet tied by handroll postmark "PFORZHEIM 30.4.27" to both sides of registered cover to Barranquilla with arrival marks on front, tiny spots on top, otherwise fine (Image)

Great Bretain, 5 c. orange and 10 c. green in combination with Columbian 1 c. red tied by cds. "BARRANQUILLA 7.VU.1925" to envelope to Medellin with arrival mark, fine (Image)

Switzerland, 30 c. blue in combination with Switzerland 30 c. blue tied by cds. "ZÜRICH 29.VI.29" to cover via Calon to Bogota with arrival mark, cover vertical fold and rought opened at reverse with small tear at right, otherwise fine (Image)