GREAT BRITAIN. 1/2 Guinea, 1813. London Mint. George III. NGC MS-64.S-3737; KM-651; Fr-364. The final example of the denomination to be struck, this near gem exhibits an attractive brilliance and a wondrous prooflike nature. On par with the Terner specimen, a PCGS MS64, which realized a hammer of $2,500 in early 2012.