The Stovebolt Site Forums The Parking Lot Panels 'N Burbs GM Panel Truck Assembly line Photo, Norwood, Ohio Plant

sstock, from all my study, and reading here, they were either all boards or all plywood. No mixing of the two.
Despite the cut outs for fenders my 52 panel is all plywood (I think 54" wide) and yes, it had skid strips to help delivery folks slide their stuff in and out of the panel..... but no telling what someone did to them over the years once they left the factory.

From pics and the post above I'd also vote 1950.

Don't want to muddy the water here and start another thread but its my understanding that for my year '52 the body and plywood was "one piece" when it was set on the frame...and I believe it after tearing mine all apart and seeing how it was.