Great Britain 1935 Silver Jubilee 2½d Prussian Blue, SG456a.
A superb unmounted mint with full original gum example from the top right-hand corner of the sheet. An exceptional example of the unissued colour being the most iconic error of colour in GB philately, known affectionately as "the King's error".
Accompanied by a certificate of authenticity from the British Philatelic Association (BPA).
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