Seems like it's too big and bulky to be a daily use spur. Maybe it's just the camera angle but it looks way bigger (wider) than a boot. The script writing looks late 1800s. Try doing a pencil rubbing of the letters on some paper and that might make it easier to read.
Too funny, I get it now. The camera angle makes it look about 10 inches across! (compared to your hand) LOL. I thought that's way to big for someone to wear. Any luck with the writing?