I do not believe it is a coin. No letters, no numbers, no head (bust). The reverse doesn't appear to have anything on it. Almost like a "home made" piece of jewelry. Perhaps an expert will chime in shortly to confirm or deny.
It almost looks like a watch fob... almost.
More info needed, generally where was it found and perhaps a bit of backstory would assist in the ID. Did you clean it, looks shiny, as opposed to old and tarnished.
Whatever it is, I like it, just never seen a coin like that before.