I'm fairly certain I have not posted this one before. I hope that if I can't remember, then neither can you. This wheel is 5.75 inches in diameter and in very good shape. It's from the early 70s, so it ought to be.
I can see how this would come in very handy. Unfortunately, it's not such a handy thing to carry about on one's person.
I don't know who or what Hornor & Company was. I found a few business with the Hornor name.