Great Britain 1856 6d Deep Green, Plate 1, SG69var.
A fine imperforate plate proof on thin unwatermarked white wove paper with trial cancellation 'KF AP- 1.1856' datestamp.
Taken from a prescription album produced for the 1867 Paris exhibition.
A key specialised rarity from the introduction of surface printed stamps, which replaced the Embossed issues.
Accompanied with a 2007 Royal Philatelic Society (RPS) certificate of authenticity.
Stanley Gibbons catalogue value: £7,500.
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