Vanguard
I don't know anything about JR but I have a couple of Airtronics radios that are about the same vintage as yours. I am relatively sure that both of them have narrow band receivers. I am not using either of them at the moment but I do plan to use them in the near future. One of them has a single stick transmitter and these are very rare now. It is the primary one that I plan to put into service.
Howard