Cover franked with 1941 pair 20c orange brown LAN issue and 3 x 1944 1p bluish slate 'International' AIR issue on front and 1944 block of eight 10c yellow green 'International' AIR issue and 1950 2p red brown LAN issue on reverse (SG 294, 351a, 358 & 399) all tied by LA MINA cds's dated 18 DIC 1951. Addressed to COLOMBIA with COPIAPO transit cds's tying the stamps on the reverse.