Promotional postcard for The Knave of Diamonds by Charlton Mann, from Ethel M. Dell?s novel (1912). First produced at the Gaiety Theatre, Manchester, 24 January and at the Globe Theatre, 23rd April 1921. The dramatist is credited on the reverse, but in smaller letters than those given to the best-selling novelist. It is claimed that this is her most famous work. Touring to Grand Theatre, Oldham.