For your consideration, here is a Vintage 1950's Glenwood City High School Souvenir Ceramic Plate, from Glenwood City, Wisconsin.  There is a history of the high school printed on the back.  The last year mentioned on history is 1958.  It has a diameter of 10 inches.  It has a little wear on the front.  The company information on the back has a lot of wear on it.  No chips, crazing or cracks.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (565.17y-2.8bs)