Air Mail 1920-29, a fine assembly of SCADTA issues including Compania Colombiana de Navegación aérea 1920 (March) se-tenant designs 10c. green unused (6, with a marginal block of four), 1920 (Oct.) 10c. green (6), carmine, brown (2), red (6, a block and pair) and carmine block of eight all unused, also 10c. carmine-red (2) affixed to pieces and cancelled by violet oval cachet, 1920 (Nov.) 30c. on 10c. unused pair, SCADTA issues 1920 (Oct.) 30c. and 50c. in mint blocks of six, also 50c. used block of six on piece, 1921 new values 10c., 15c. and 30c. in mint blocks of six and others; SCADTA (General Issues) with 1920 with manuscript "Mejia" overprint 30c. (2) and 50c. (2) mint, a further 50c. with unlisted "KÜ" (Kühn?) manuscript overprint, various Consular overprints and 1929 (June-July) series to 5p. in blocks of four or singles, and the series to 3p. in complete sheets of fifty or twenty-five (peso values), all with backing paper attached. High catalogue value. (several hundred)