George III, Pattern Half-sovereign, 1820, struck in silver, large laureate head right, date below, GEOR:III D:G: BRITT: REX F:D: similar to the adopted Sixpence obverse, rev. struck en medaille, crowned rose, thistle and shamrock, BRITANNIARUM REX FID: DEF: edge plain (cf.WR 206) brilliant, as struck, very rare
George III, Pattern Half-sovereign, 1820, struck in silver, large laureate head right, date below, GEOR:III D:G: BRITT: REX F:D: similar to the adopted Sixpence obverse, rev. struck en medaille, crowned rose, thistle and shamrock, BRITANNIARUM REX FID: DEF: edge plain (cf.WR 206) brilliant, as struck, very rare

Details
George III, Pattern Half-sovereign, 1820, struck in silver, large laureate head right, date below, GEOR:III D:G: BRITT: REX F:D: similar to the adopted Sixpence obverse, rev. struck en medaille, crowned rose, thistle and shamrock, BRITANNIARUM REX FID: DEF: edge plain (cf.WR 206) brilliant, as struck, very rare
Provenance
H. Selig, Spink Auction 131, 2 March 1999, lot 1177