DOULTON, Sir Henry. 19407 A lengthy Autograph Letter Signed, to “My dear Sparkes”, sending condolences on the death of his mother. 4 pp. 8 x 5 inches, fine. Woodlands, Tooting Common, 16 February 1875. Sir Henry Doulton (1820-1897), inventor and manufacturer of pottery, instrumental in developing the firm of Royal Doulton.