| Descrizione |
''Navíos de Registro'': ships used for commercial purposes that carried correspondence (in sealed boxes) ''free of charge'', to be rated on the destination harbour and postpaid by the addressee on arrival. 1780 ca. Cover to Concepción de Chile endorsed ''Por el Navío Príncipe Carlos'' (this ship opened up the route via Río de la Plata) charged with framed rating marking of 5 reales and straight-line ''España'', both in red applied at Cádiz; also a cover to Santiago with straight-lines ''3 de Plata'' (reales) and ''España'', both very probably applied at Cartagena de Indias. A scarce pair including a very rare item carried by the ''Príncipe Carlos''.
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