1976 US Nickel No Back

Wish the reverse was a clearer picture but with John. This is PMD.
The reverse was subject to a file, drill, sander. or some other means of grinding off the back/reverse.
Oops! KeevKR500, this is a very knowledgable site to learn. Keep asking questions and read here at CCF.

I'm going to say it was a botched Magician's coin. They have machines that grind away the coin to a convex or concave to fit two coins together and make a double-headed coin or a magic "changing" coin as the case may be. I can see the rim all the way around on the reverse, so my guess would be that this coin was destined to be a Magician's coin but the machine did a little too much grinding and the extra "heads" wouldn't fit. So they just filled it in with whatever and tossed it in a nickel roll. Try flipping it (like "heads or tails") and listen. If it rings, the back was simply filed off. If it just goes "thud" then it was filled back in with solder.

Very interesting find, but unfortunately just worth 5 cents.

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Looks like it is just filled it grungy old gum or some other adhesive

I too think it was a Magician's coin at one time. Check to see if the back scratches easily. Might be as already noted, filled in with Lead.