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PERU - REVENUES PAGARES VELES Y LETRAS (LEY 7622) 1937 1sol IMPERF DIE PROOF OF FRAME printed in the blackish brown with die number above and attached onto 'Index Copy' archive card with manuscript and typed notes, with the issued 1sol brown with 'Specimen' opt attached alongside. Overall size approx 230x150mm. Fine condition, very attractive and unique exhibition item from the ABNC archives.