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PB, your Griswold lid is coated with enamel on the inside and was called a "clean easy" lid. It's also known as a "button lid" because of the TM on the top. Although I'm a new collector, I speak with authority on this topic because I have that lid and DO...and I bothered a lot of people to find out what it was and how to clean and season it! (Right, Doug?) :chuckle: