Dollar Bank of England 1811 Five Shillings and Sixpence Proof in copper Obverse K Reverse 5a, struck on a thin flan and weighing 22.41 grammes, ESC 206B, Bull 1998 nFDC toned with residual mint lustre and prooflike fields, only rated 'Scarce' by ESC, surely rarer than this, especially in this high grade