I have for sale the SOHIO DAY (Standard Oil Co. Of Ohio) souvenir celluloid pinback button from the 1937 Great Lakes Exposition that was held along the shore of Lake Erie in Cleveland, Ohio.  The exposition celebrated the centennial of Cleveland's incorporation as a city and the expo was held in the summers of 1936 & 1937.  The button is 1 1/2 inch diameter and in a high-grade circulated condition, see photos. The button in the center reads SOHIO DAY and at the bottom it reads GREAT LAKES EXPOSITION 1937.  Please see over 950 more collectibles for sale in my EBAY STORE at TE Collectables.  (20,131 TRC)(RS)