William IV, proof Sixpence, 1831, by Wyon, struck on a very thin flan, weight 1.94g., bare head right, rev. inverted, crowned mark of value within wreath, edge plain (ESC 1672A R7; Davies ---), light tone, practically as struck, of the highest rarity
William IV, proof Sixpence, 1831, by Wyon, struck on a very thin flan, weight 1.94g., bare head right, rev. inverted, crowned mark of value within wreath, edge plain (ESC 1672A R7; Davies ---), light tone, practically as struck, of the highest rarity

Details
William IV, proof Sixpence, 1831, by Wyon, struck on a very thin flan, weight 1.94g., bare head right, rev. inverted, crowned mark of value within wreath, edge plain (ESC 1672A R7; Davies ---), light tone, practically as struck, of the highest rarity