I'd say definitely unrestored and from a non-rustbelt state....
In 1992 it was shipped from San Dimas, CA to Granby, CT.
Curious: Why do you ask?
I have a numbers matching 1969 Z that is being restored. The underbody has not been painted yet. I would like to bring it to the Camaro Nationals next year. Before starting the restoration, my car had loads of gray primer with some black areas. I believe to restore it the way it was originally, I should put back the gray primer. However, to do well with a judged car, it should be uniform 30% gloss black.
I have seen many original cars on this site that had a lot of black with some gray on the underbody. However, there are other original cars that have a lot of gray with some black on the underbody. I have been reading old Camaro Enthusiast magazines and there are low milage original cars there that have primarily gray underbodies. I believe that since the underbodies were primered with the gray primer by hand, there are huge variations in what was done originally.
Part of me was hoping that everyone would have mostly black and my car was a weird fluke with the gray. Then, I would just have it painted 30% gloss black. As it stands right now, I'm not quite sure what to do.