Morocco Agencies 1914-26 Spanish Currency 1p on 10d turquoise-blue, watermark Simple Cypher, overprinted 'SPECIMEN' (type GB23), lower right corner block of 4 from upper pane initialled 'CD' in pencil, SG135.
A very fine and fresh, unmounted mint positional block with full original gum. An important positional multiple, unique in private hands, and never previously on the market.
"SPECIMEN" examples were used solely by postal administrations for reference purposes to help spot any attempted forgeries.
Provenance: Ex British Postal Museum Archives (BPMA).
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