I can't see it being used as a back seat because the back side would not have been covered also. I took it to an upholstery shop that has been in business for nearly 40 years. The owner had his dad (the original owner) meet us there....They both agreed that it's original material based on the stitching alone. He said that only the factory would have used stitching (size) like that. He's guessing that it's a late 40's early 50's Ford....the search for answers continues.... thanks to all that have posted ideas, I appreciate it greatly.
PS: it's looking more and more like I'll end up using it as a shop couch....it's actually quite comfy