Yes, post-strike damage of a vicious nature. Some lateral scraping/abrasion has exposed the zinc core. Coin may have spent some time in soil, or muck at the bottom of a pond.
I have been reading everything I can it will take a minute to get a good read on these perimeters of what it is to look for. So tell me one thing so if they who register these errors do not say there is an error or haven't seen it yet that means it's not an error made by mint?
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