Hmm, I don't think it's a mint error - looks more like post-mint damage to me.
The grey colouring in the protected areas is odd. These are supposed to be bronze coins. Perhaps someone plated/painted it silvery colour to pass as a higher denomination coin? Or maybe it was part of a piece of budget jewellery - that might also explain the rim damage, if it was mounted somehow.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis