The inside of that (concave side) has a cool look to it.
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but is this a start on a "spooning" that leads to making a ring?
A spooned coin ring stays flat. The rims gradually get wider during the process, causing the coin to look thicker if you were to look only at the edge.
There is another ring making process where a whole is drilled in the coin first, then the coin is turned (halfway) inside out on a mandrel by hitting it with a rubber mallet. It would sort-of have this kind of look to it a one point, but would have a hole in the middle.