This c1775 English enamel writing casket bears the arms of Lionel Sackville, 1st Duke of Dorset, Lord Lieutenant of Ireland 1751-55. It comes up at Sotheby’s live sale of American Furniture, Silver and Decorative Arts in New York on January 19 with an estimate of $15,000-25,000. Measuring ten and a half inches long it is thought to be probably Birmingham.