I can't be sure of the storage conditions for the entire time since the restoration, but it had a frame off restoration about 6 years ago. For the last 5 years it's been in a climate controlled building. I doubt that it ever got very dusty. Another important bit of information is that it has the same discoloration on the opposite side. I was wondering about condensation/moisture problems or maybe since it's around the hardware for the seat belts and hangers that it could be corroded fasteners or something like that..
This is the other side.
