Great Britain. Bronzed Proof Half Farthing, 1837. S.3849; KM-724. William IV. Obverse; Bust of king right by Wyon GULIELMUS IIII DEI GRATIA. Reverse; Britannia seated. Brilliant mint state and more detail evident on the king's hair than seen on the regular issue. Superb mirror fields. Excessively rare, unlisted by Peck and no specimen in the Colin Cooke collection of farthings and fractionals. At Grading Service, Final grade on Web Site. Estimate Value $2,000 - 2,400