I think like you, that is a cover to a lock. I know Yale used to make hinge covered locks a long time ago but cannot seem to find anything on the internet about them. If my dad were still alive he could have told me he used to be a locksmith, alas he is not. As I indicated above what you see is what you get. No other writing on it is simply a flat piece of metal that has the word Yale on the front of it. It was found at a home bulit in 1910 in close proximity to a 1898 IH and a 1918 wheat penny. No matter what it is an interesting piece I just wondered what type of lock it came off of. Thanks for everyone's help and input!!!!!