I cheated. I've seen a lot of cents removed from encasements with damaged rims, so the encasement idea was a good one. I also know that a lot of souvenir
Encased Cents were made at the Pan American Exhibition in 1901 with 1901
Indian Head cents in them. So I went looking for an image of one to see if the marks would match up. They did, so I posted.
Usually you can't find the specific encasement that produces the damaged rim you see on a "removed from encasement", but the 1901 date made it easy because the 1901 Pan American encasements are very well known. If it had been a 1904 I would have gone looking for a 1904 St Louis Worlds Fair encasement. There aren't a lot of
Indian Head cent encasements.