Cover franked with 1917 1c green and 1923 strip of three 3c blue national issue plus 1923 30c dull blue SCADTA issue (SG 358, 394 & 41) all tied by BOGOTA SCADTA cds's in red. Addressed to SWITZERLAND with fine strike of boxed 'Profitez du Service, Postal Aerien de Colombie (Economise 10 jours!). Renseignements, M. ROETHLISBERGER A., 3, Rue de la Prefecture BERNA' Swiss consular agents cachet in purple with text in French on reverse. Scarcer type.