Persian slipper

This is the Persian slipper which Richard Lancelyn Green collected for his creation of 221B Baker Street.

In “The Musgrave Ritual” Watson says Holmes 'keeps his cigars in the coal-scuttle, [and] his tobacco in the toe end of a Persian slipper'.  Conan Doyle also discussed this unusual habit in The Complete Stories and Memoirs of Sherlock Holmes.