Might be an older decorative button with the back shank broken off??
Yes, Now that I look, I see that the writing is reversed on the sides like it has been stamped., I'm sorry for asking such a stupid question. Maybe it is a button as mentioned ? I searched different dynasty coins, Chinese, Japanese coins and didn't see anything like that. The lettering doesn't look Korean so I think we can rule that country out, which would have made sense if it were but I'm guessing it isn't. I'll keep looking for a button,since I have nothing better to do.That is piture of both sides it looks to be stamped