If you have any pics, we can help you figure out which year yours is. Ours is a 1973. No rear cargo hatch under the table area, smaller front window and bigger front closet.
I agree, you can look here under Search (bottom of drop-down, not the top blank spot) for the appliance manufacturers, and also search online and ask them directly. as well.
I have a copy of the original 1973 Amerigo Owner's Manual and will send you a copy if you will e-mail me (click on my avatar and push "Send e-mail to Kai in Seattle." I believe the basics are the same for all the years the FG16 was made.
Welcome to FGRV, and welcome to amerigo ownership!
Have you decided to name yours yet?
Ours is "Peanut."
One shell with two nuts in it.