[I.B.M. CONVENTIONS]. International Brotherhood of Magicians Window Card Collection. Kenton: Scioto Sign Co., late Ca. 1927-28. A group of 30 pictorial window cards printed to advertise some of the earliest convention shows staged by this fraternal organization and advertising the conjurer appearing at the convention. Among the performers represented are: Jack Gwynne, Ovette (including variant colors), Tom Bowyer, David Rose, Roberta and Marion, Al Saal, Oswald Rae, Al Caroselli, E.J. Moore, Harry Cecil, Jack Chalk Danks, Don Carlos, and others. Each 22 x 14". Some with date snipes. General toning, some chipping and wear, a few with pinholes, but good condition overall, with several uncommon cards included. Minor duplication. An impressive grouping of cards printed by the company owned and operated by the driving force behind the IBM, W.W. Durbin, lacking only a few examples to complete the collection. It has been said that instead of paying the acts to perform on the bill, Durbin offered a quantity of these window cards as an in-kind honorarium for their appearances.