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I disagree, coop. Usually if you acid dip a coin, it'll make the coin all bubbly and stuff.
No, although I don't think acid was involved here either. Acid can eat away a coin with perfect equilateral smoothness, imparting a nice matte finish.
If the coin has reeding, and it does, it
had to have been properly struck in a collar originally. No other answer is possible. And if it were struck on Dime stock, one has to wonder just how thin the resulting coin would be if it managed to reach the collar all around. It's not round - something you'd expect from a Quarter struck on Dime stock - but you'd expect no reeding on the areas which didn't touch the collar.
Is the reeding visible all the way around the circumference?
I'm actually kinda intrigued by this one.