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Like Don/WI said; It's fairly obvious the stamp was put on before the part was formed. It was an Empire inspector that stamped the raw matl when it was still a sheet. The pan was probably formed in a punch press out of a sheet the pan manufacturer (possibly Ford) purchased from Empire. That would tell me that there's a chance that there are more of them out there but not every pan is going to have the stamp on them. There are probably 6 or 7 more out there that came from the same sheet of steel. What a fantastic find.