Great Britain 1935 2½d Prussian Blue, SG456aGreat Britain 1935 2d Prussian Blue, SG456a. A very fine and fresh unused example, with original gum, of this famous "error of colour". Offered with the normal 'blue' shade for comparison. Accompanied with a 2007 Royal Philatelic Society (RPS) Certificate of Authenticity. Provenance: Ex Burrus. Maurice Jean Marie Burrus (1882 to 1959) was a French Philatelist and legendary collector. The name Burrus is synonymous with great Provenance. Burrus was an
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