I have heard of or seen the following Terra models before.
Terra Cat
Terra Floater
Terra Torque
And of course my Terra Tandem
Definately a rare find .
I talked with a member on here who grew up in Crawfordsville Indiana where Terra Products was based out of. And he told me about the owner Jack Canine a Shriner who built Dune buggies and mini bikes for the Shriners and some for the general public. Then he turned to Agricultural products and later changed the company to Banjo Corp. He now lives in Florida , and he also owns a Banjo museum in Ok. I have called him and left a message for him, but he is a very busy man. He still owns the company and the museum and is in a traviling Banjo band
He is in his 70's now. Good luck with your project :thumbsup: