Great Britain 1867 2s dull blue Plate 1 Specimen, SG118var.
A superb unused imperforate top marginal pair lettered FI-FJ, overprinted "SPECIMEN" type 6 showing part sheet inscription "Postage TW".
GB Specialised Catalogue No: J118(1)t.
"SPECIMEN" examples were used solely by postal administrations for reference purposes to help spot any attempted forgeries.
Stanley Gibbons catalogue value: £1,400+.
