Oh please, this is the 4th post with the same photo.
Let me give you an advice of mine, from an experienced user of the site: when an ID thread goes to the bottom of the forum without answers, you can just make a new post on it to bump the thread back to the top of the forum, instead of creating a new thread.
And, you didn't wrote the diameter of it. This is a powerful search filter.
Other than that, I don't think I can help you more, I don't recognize the coin.