Watch List notes:

George III (1760-1820), Emergency Issues (1797-1799), Oval-Countermark Half-Dollar (4-Reales), 1774-JR, Potosi, laureate and draped bust of Charles III right, oval countermark of George III in centre, rev. crowned square-topped shield dividing pillars, security edge, 13.09g, 12h (Bull 1880 [R2]; ESC 611; Spink 3767), scratch in obverse field, the host coin stained and rubbed, about good / a bolder fine, very rare.
Provenance
SNC, June 2003, MS4942 - coin F, the countermark good VF - £250
Estimate: £200.00 - £260.00