Watch List notes:

William IV (1830-1837), Proof Halfcrown, 1831, bare head right, block W W on truncation, reverse crowned shield on mantle, edge plain, (Bull 2473, ESC 657, S3834). About as Struck, delightful blue/purple toning. Encapsulated by NGC as PF61. We believe this has been conservatively graded. Ex Seaby 3/11/1967.