Cover franked with 1924 3c blue 'National' issue and 1923 30c dull blue SCADTA issue tied by BOGOTA SCADTA cds's (SG 404 & 41). Addressed to USA with fine strike of boxed 'Use the Colombian Air mail ! It saves you 10 Days ! Information and Stamps: International Trading Co. CHICAGO. 12 N Michigan Ave.' American consular agents cachet in purple on reverse.