Great Britain 1935 2½d Prussian Blue, SG456aA very fine mint example of the most iconic stamp error in GB philately The Kings error. Great Britain 1935 2d Prussian Blue, SG456a. A very fine and fresh unused, with original gum, top marginal example of this ever popular "error of colour" offered with the normal "blue' shade for comparison. Accompanied by a copy of a 2013 British Philatelic Association Certificate of Authenticity of a vertical pair from which this single was taken. The Story King
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