I don't think I would touch it. Grand Ma's skillets always did great.
When Mama got a range with self clean feature she cleaned them off and they just didn't perform the same. They will rust deep into the metal if you don't get oil into them before they cool.
Never ever let soap and water touch the inside. Clean with salt and oil if you have to and wipe it out with more oil.
I have/had a hard time getting my wife to see it that way. One of Grand ma's old skillets is coming back. I have to make sure she doesn't use soapy water on it. just my one and half cents worth.