Great Britain 1856 6d green plate proof, SG69varGreat Britain 1856 6d green plate proof, SG69var. A superb imperforate example on thin white card, neatly cancelled by black Helmsley Crown experimental circular date stamp for "2. 4. 56. Taken from a prescription album produced for the 1867 Paris exhibition. A very scarce specialised Queen Victorian stamp. Stanley Gibbons catalogue value: 7,500. Order online, by phone +44 (0)1534 639 998, or via email info@paulfrasercollectibles. com
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