Great Britain 1935 2½d Prussian blue, SG456aGreat Britain 1935 2d Prussian blue, SG456a. A superb unmounted mint, with full original gum, example of this famous error of colour. Offered with an example of the normal colour stamp for comparison and display purposes. Accompanied with a 2011 Royal Philatelic Society (RPS) Certificate of Authenticity. The Story King George V (known as the Stamp King) was a passionate stamp collector. So, on June 6th 1934, when he was asked for his permission for a
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