Cover franked with 1859 120c blue 'Montevideo' SUN issue, thin figures of value (SG 11) with four good to large margins tied by oval MONTEVIDEO cancel dated 7 NOV 1859. Addressed to BUENOS AIRES, ARGENTINA conveyed across the River Plate by ship with manuscript 'Pr d'Puntecasteaux' ship endorsement on front. 1992 BPA certificate accompanies.