That's exactly what it is. someone has experimented by dipping it in an Acid solution.It is now considered damaged but it is a good piece to keep for show and tell.
The reason its difficult to find about acid dipped coins online is b/c there are somany way in which a coin can be damaged. It would be impossible to list them all. Some kinds are more common though and so we know about them and can share. As another example, take this link to Dryer Coin
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