Here is a photo of an ad for a Charleston contest in Coney Island, 1926. This comes to you thanks to the generosity of historian/collector Jame E. Loeffler.
The photo was taken by Century Flashlight Photographs, 144 West 46th Street, New York, a prestigious firm as can be seen by the fact that this firm took the following photo
Daniel Guggenheim Fund luncheon. (Back row, from 3d from l.) Charles A. Lindbergh, Hiram Bingham, and Harry Guggenheim. October 5, 1928. Luncheon at Yale Club, New York, for the Chairmen and Contributors to the First National Aeronautical Safety Conference.
PS Here is the link to James' website. http://www.docjazz.itgo.com/