Great Britain 1856 4d carmine on thick blued highly glazed paper Plate 1 (Watermark Medium Garter), SG63s.
Superb unmounted mint left hand marginal block of six showing part sheet inscription, overprinted "SPECIMEN" type 2 vertically.
A quite spectacular Queen Victorian rarity.
GB Specialised Catalogue No: J48(2)t.
The Stanley Gibbons catalogue value is £7,200+.
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