1919, Experimental Flight from Barranquilla to Puerto Colombia, black overprint on 2c carmine rose, large part of OG, VF and rare, only 260 stamps were overprinted and no more then 49 remained uncancelled, E. Kessler guarantee hs, Colomphil certificate, C.v. $3,500, Est. $1,600-$2,400 (Image)

1923, ''Bo'' overprints on 5c-5p and over red ''R'' on 20c for Bolivian Air Post correspondences, complete set of 12, usual dry gum, LH or hinged, mostly VF and scarce, only 50 complete sets possible, each stamp with E. Kessler or Sanabria guarantee hs, C.v. $492.50, Est. $250 -$300 (Image)

1928 (July 17-19), large size registered cover from Bogota to Vienna, franked by 16 stamps (10 - on reverse), delivered by SCADTA Flight Bogota - Barranquilla, arrived to NYC on August 2 and forwarded to Vienna by a steamship (no backstamp as usual), VF, Est. $150-$200 (Image)

SCADTA Items. 1920, Seaplane over Magdalena River, 30c and 50c with red signature of G. Mejia, Consul of Colombia in NYC, both with will OG, LH or previously hinged, VF, S. Sismondo certificate, C.v. $200 (Image)