You should put that in your upcoming book to show how one should NOT treat a coin
Airtight capsules are only cheap and worth every cent when this is what can happen.
Not a bad idea, or at least a blog post!
Interestingly enough, this coin is fairly prominent on the book's front cover.
Just so you know, I am not the one who did this.. I bought it in a lot with several other redeemed coins.