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✉ ESPAÑA. Ed. 1. 1850. JACA a MADRID. 6 cuartos negro, pl. I tipo 4, mat. ATAUD DE JACA en azul, al lado fechador JACA/ARAGON. EXCEPCIONAL y ÚNICA CONOCIDA. Cert. GRAUS y COMEX. Procedencia: Luis Cervera, Pedro Miranda. 6 cuartos black, Plate I, Type 4, used on cover from JACA to MADRID cancelled by framed COFFIN OF JACA handstamp struck in blue with JACA / ARAGON datestamp alongside (Feb 13) in red. Exceptional and the sole known usage on letter. Unique. Cert. COMEX, GRAUS. Provenance: Luis Cervera, Pedro Miranda.