I just got this pan and realize it's the top of a two part set. I cannot find anything like it. It says it's "80"; it says Erie. But it also has patent numbers and other numbers on it, which I don't see in any other picture of a Griswold pan. The patent numbers are 1,554,360 above the Erie name and below it says pat. # 97,022. I can't seem to get the picture to fit on this thread.