Original "International Brotherhood of Magicians" Ring Convention Window Card

From my private collection of Magic posters, this is a rare window card advertising one of the International Brotherhood of Magicians conventions that took place at the Southern Theater in Columbus, Ohio. Since none of these scarce cards have surfaced, I am not sure of the date but would guess it to be from the 1930's or 1940's. It measures approximately 14" x 22" and is in good condition.

The International Brotherhood of Magicians was founded in 1922 and is the world's largest organizations for professional and amateur magicians. There are more than 300 local groups, called "Rings" in over 30 countries. The I.B.M. consists of approximately 15,000 members worldwide.