£6,000 - £7,000
STAMPS GREAT BRITAIN 1935 PRUSSIAN BLUE 2 1/2d fine used, one of the rarest stamps of Great Britain . 1991 BPA Cert SG 456a Cat £15000. The printing error occurred when the wrong ink was used. It is believed the only around 200 of these stamps exist today with used examples being much scarcer then mint.
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