Hello, Shaina --
Thank you for your patience in posting the images. This is some type of post-mint alteration, but I can't tell what the little plug says. It could very well have been a coin that was altered either for the sake of making jewelry or perhaps was a used as a promotional token for an organization, etc. At any rate, altered/novelty coins like this are sometimes worth a couple dollars, but the value would be on the higher side only if the origin can be determined.
I hope this info helps,
Josh