Thank you!I have to agree with gunsil, that it's likely a decorative clothing buckle, knowing the size will definitely help.
It's made of stamped brass, as opposed to cast brass, which means it's not a horse harness buckle. Also, these clips on the back would indicate that was attached to either a leather or cloth belt. Date wise, I'm thinking 1900 - 20.
Looks like a sash buckle. It helps to put a ruler or or a known object like a quarter in the photos so we can tell how big the item is. I do not think it went over anything but a photo with a size reference would help for su
Thank you!Is it brass It looks like it was used on leather horse harness I have quite a few different sizes and types I love finding them Nice find