I also found these 2 coin rolling. I thought they might've been subjected to heat or electric current. I have not soaked either of these. Thanks for looking and all advice is appreciated!
P.S. I also have a 4 coin set from IH( a truck manufacture) from 76'. I want to know more about them,but not sure where to post. I'd appreciate info on the correct place to post. Thanks!
That is simply environmental damage. As for the color, the bottom of my dad's metal coffeepot has rainbow color from heat. Same with pots out of the dishwasher sometimes.
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