Great Britain 1856 4d carmine on thick blued highly glazed paper PIate 1 (watermark Medium Garter), SG63s.
A superb unmounted mint left hand wing margin example with full original gum overprinted "SPECIMEN" type 2 vertically.
"SPECIMEN" examples were used solely by postal administrations for reference purposes to help spot any attempted forgeries.
GB Specialised Catalogue No: J48(2)t.
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