I have a couple of Griswold Stove Dampers. Both of them are 6 inch dampers. I think the one is pretty common, but I am wondering about the other one. It has a Patent Date of April 20, 1880 and another date of June 18, 1889. I have cleaned both of the dampers but the one has some pitting. Can anyone tell give me information about the American Erie PA? Is it rare? Value?
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