I have no idea how old it is but The horseshoe is a good candidate for electrolysis bath. after all the crud is off, you may see a brand name to help you date it. electrolysis is a great way to clean iron objects and easy to learn. practice now so when you find something really nice you'll know how to proceed.
I'm no horseshoe eggspurt, so I have no idea about date, good luck with that.
The Mr. brought home a milk crate full of horseshoes he found in the Everglades.
They looked about like yours does.
I cleaned some of them in a 5 gallon bucket with vinegar & a metal brush.
I had to let them soak a day or 2, but they cleaned up, to almost new.
A few of ours still had the nail in them, too.
Welcome to Tnet!
Don't see anything odd other than the nail. I think it's a factory shoe rather that a smith made shoe. I would paint it with a linseed oil/minerail spirits mix and hang it on the barn door.