Plain cover franked with 1930 15c slate grey and 1b 20c blue green AIR issue (SG 397 & 402) tied by CIUDAD BOLIVAR 'Arms' cancel in purple with '-8 ENE 1931' datestamp alongside. Flown on the Ciudad Bolivar - Port of Spain, Trinidad first flight by Vachet with large circular 'COMPAGNE GENERALE AEROPOSTALE AEROPLACE DE CIUDAD BOLIVAR' cachet in blue on reverse. Addressed to TRINIDAD. A very rare flight only 144 covers were carried. (Muller #57, rated 1500pts)