Watch List notes:

*Sierra Leone Company, silver proof 20 cents, 1791, obv., sierra leone company, africa in exergue, crouching lion on hilltop, rev., twenty cent piece, clasped shaded and unshaded hands, '20' above and below, edge plain, 4.97g (Vice FT 4A; KM4), choice mint state, slightly uneven greenish tone, very rare. 84 examples struck by Matthew Boulton between 1793 and 1799.
(1000-1500 GBP)