I did some research on line about the factory in Connehuaut OH, and eventually got a phone call back from an ER Dr. who is the official Conneaut OH Historian. He talked me ear off about the factory and its history. don't remember his name, but if you go to Conneaut's webpage and look up "history" or something of that sort, you may get a call too. He said the 6" and the 24" models are the real collectible ones. My 12" is pretty plain Jane and maybe worth $70 tops.
DM&FS