George V 1911 proof Half-Sovereign PR64 CAMEO, Coronation issue

George V (1910-36),gold Proof Half-Sovereign, 1911, bare head left, with raised BM for Bertram Mackennal on truncation, legend and toothed border surrounding, GEORGIVS V DEI GRA: BRITT: OMN: REX F. D. IND: IMP:rev.St George and dragon right, date in exergue, B.P. to upper right of exergue, edge milled (WR 418; S.3996).Lightly toned, has been graded and slabbed by PCGS as PR64 CAMEO, becoming scarce in the UK market place.