Great Britain 1856 4d carmine on thick blued highly glazed paper Plate 1, (Watermark Medium Garter), SG63s.
A superb unmounted mint bottom marginal block or four showing part sheet inscription, overprinted "SPECIMEN" type 2 vertically.
A stunning quality scarce position piece. "SPECIMEN" examples were used solely by postal administrations for reference purposes to help spot any attempted forgeries.
GB Specialised Catalogue No: J48 (2)t.
Stanley Gibbons catalogue value: £4800++.
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