It looks like a mold of some kind, the image doesn't follow a buffalo nickel. Liberty is backwards and looks incuse? Very interesting.
Not a US nickel - possibly a lead impression of an obv.of a nickel on both sides, but not a mint product in any way.
Welcome to CT...may I suggest reading this? https://en.wikipedia.org/wiki/Buffalo_nickel Best collecting to all.
Possibly a poor quality contemporary counterfeit. As Fred said a lead disk squeezed between two coins. I have seen others like this, but usually they did manage to make them have both a heads and a tails instead of the same on both sides.