Interlocking puzzle #6 in Hall-Court series produced by Simpkin Marshall, Ltd, London, England 1930's. Box picture is of puzzle #1 in series but puzzle is correctly boxed. Unknown artist. A lovely puzzle. Simpkin Marshall was a British publishing company based in London. The company was founded by Benjamin Crosby as Crosby and Co. William Simpkin and Richard Marshall were Crosby's assistants. Upon Crosby's illness in 1814, the company name changed to Simpkin and Marshall. In 1890-1891 the firm expanded and became Simpkin, Marshall, Hamilton, Kent and Company.