George, do you have the VIN plate on the passenger toe board ? That should tell you the model and if rusty turn it over and hopefully the stamping will show in reverse. Might also give you the car number which you can verify in DMAC VIN number listings. This has the folding front seat, before VW no window vans got made into love making machines.
Actually what was the real purpose of these Pullman cars ? Long trips to over night before carrying on ? Campers with trunk on the rear for clothing / utensils ?