Makes sense on the reverse lettering and indentations.

Pictures were taken with an I Phone and cropped.
Had a coin dealer look at it. He told me it was a minting error. But that’s all he could say about it.
Have a hard time believing it was put in a vise or another coin hammered to get this effect.
But at least it an answer to my puzzle.
Thanks D

Found this in my change and wondering more about this type of error.
Seems to have a few things going on with it.
Both sides are the same coin.

Dale from Calgary