Great Britain 1909 ½d yellow green, SG218b var.
A superb unused, with original gum, bottom marginal block of four from positions R.20/3-4 showing variety doubly printed from control H9. Most importantly, the printing varieties are unmounted mint.
One of the great rarities of GB philately with only 13 known examples, this being the only known surviving multiple and therefore unique. The printing variety occurred only on the bottom rows of one sheet with control H9, with 13 stamps showing partial or full doubling.
GB Specialised Catalogue No: M2(2)d.
Stanley Gibbons catalogue value: £75,000+.
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