Hello and welcome.
You are correct in that it's not a coin. The hole ont he back makes me think it was orignally some kind of button, ar attached there to some larger object like a piece of furniture.
Also, it doesn't look solid gold to me - gold doesn't normally stain like that.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis