Autograph Letter Signed in full, ‘Arthur Conan Doyle’, addressed ‘Dear Sir’ [Mr. Rose], taking up a newspaper’s suggestion “that some Motor Cycle firm should prepare a machine & trailer expressly for Commercial Travellers”, suggesting the Roc Cycle Company should take this up, “the C.T. Motor Cycle”, commenting also on possible additions to the board of the Company. 1½ pages 7 x 4½ inches, in good condition. Grand Hotel [London] WC, 26 May 1903. Sir Arthur Conan Doyle (1859-1930), author of The Adventures of Sherlock Holmes. Conan Doyle had a financial interest in the Roc Cycle Company, a motorcycle manufacturing company in Guildford, which experimented with a number of unorthodox designs.