Cover franked with 8 x 1944 20p grey olive 'International' AIR issue and 1955 3p violet blue (SG 366a & 442) tied by unclear CHUQUICAMATA cds's with fine handstruck CHUQUICAMATA registration marking alongside and boxed 'Tto. Antof. No. 6449' transit registration marking. Addressed to USA with arrival markings on reverse.