I found a 2016 Harpers Ferry Quarter that caught my eye as the color was different and appears to be a cladding error. If anyone has any advice or can elaborate about this coin it will be greatly appreciated. The coin weights 5.67 grams
Agree with toning/discoloration--the result of exposure to an environmental agent. I've seen similarly toned/discolored clad coins over several decides of coin hunting. This quarter may (may...) have spent a little while in a mall fountain.
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