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
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
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
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
