George VI 1937 15-piece proof Set, Coronation issue

George VI (1936-52), 15-coin silver, bronze and brass proof Set, 1937, Coronation year, 0.500 silver Crown, Halfcrown, Florin, English type Shilling, Scottish type Shilling, Sixpence, Threepence, Maundy Set, brass Threepence, Bronze Penny, Halfpenny and Farthing, all housed in original Royal Mint red leather case with gold block crest and lettering (S.PS16). Some of the silver with dark peripheral tone, practically as struck.