Door Lock from Late 60's

I'm afraid I don't know what part it is you need. Your photo only shows the frame. Can you specify what the exact part is? Would you happen to have it on hand for us to see? If it's missing, then it will be very difficult for us to find a match. We would at least need to see the other parts that interact with it so that we have some kind of context of what you're trying to replace. Let me know if that will be possible.