I don't think it's a horse shoe.
like you said never seen one with that sharp of a bend.
Can you show us the other side?
You might want to give it a couple of good wacks with a hammer and knock of a bit of the rust.
I can see some nail holes in it, im cleaning it up now to see if there is a 7 pattern. I found it on the site of an old stables, hence the idea of a horseshoe