George VI 1937 proof Shilling English reverse PF65 Coronation issue

George VI (1936-52),proof Shilling, 1937, struck in 0.500 silver with English reverse, bare head left, tiny HP below truncation for engraver T. Humphrey Paget, Latin legend and toothed border surrounding, GEORGIVS VI D: G: BR: OMN: REX, rev.struck en medaille, lion standing left on imperial crown, crown with ermine interior, date either side, K and G either side at top of lion tail for engraver Kruger Gray, denomination below, Latin legend and toothed border surrounding, .*.FID. DEF IND. IMP.*., edge milled (Bull 4121; ESC 1451; S.4082).Practically as struck, some toning at periphery, has been slabbed and graded by NGC as PF65.