Re: Pan American
I have a Pan American alto in my collection. My understanding is that Conn marketed their older instruments under the Pan American label, just as Buescher did with Elkhart and Martin did with Indiana. Also, King used Cleaveland.
The Pan Ameican may not have all the bell and whistles as the older Conn, and possibly the workmanship may not be quite as good. But they are generally pretty decent horns.