Need you pros to help me out please

I found this next to a tree about 2” down. The tree was right next to an old house probably late 1800’s. I have been looking online and in books but can’t seem to find anything exactly like it. Lots of this about it like the crown or eight point star show up on German buttons or some British. Size comparison it would be bigger than a dollar coin. It looks like some kind of badge or buckle. Thanks for any help on it