If it's not level sometimes it'll jam up or a nickel will get hung up. It's extremely old and just overall beautiful piece of history. You can mount it on the wall or on a Coca-Cola stand.
I've seen both done. Last picture under Thomas flooring for serious questions. Lock has been removed and not on there. It will need a new lock and those are found just about anywhere.
Especially ace hardware if you have one near by in your state.