Interesting what you had to say about the keys. So far (before your statements) I was unsure if keys like that were actually distributed by dealers or if they were an aftermarket thing only. I guess they were both. In the case of my keys, I think the original owner (Ray Sebo) bought them (or earned them ha ha) from the Chrysler Seifert Baldwin Dealer (Winona, MN) as his name is STAMPED on the back of the medallion. His address was scribed on back of one key with a precision engraver, which he certainly did himself at home because it wasn't very precise.
Thanks for posting this as it is very interesting, and its now something I can refer back to. Kinda makes my set of key more than a novelty; I wonder if the original owner had bought other cars from that particular dealer before, or what the story was behind it. I guess I could call his daughter again, but I'm guessing she wouldn't know as she was pretty young when he bought the car new. Her stories came about more from the late 1950s.
Here's a couple pics in case anyone missed these in earlier posts: