I scored this off eBay; some of you may have seen it when it was listed...
Now I don't know hardly anything about early, non-Flyer S scale: come to think of it, I really don't know that much about Flyer stuff either.
Anyway, I'm thinking this may have been a kit, given the quality of the scored sides and ends. Or it could have been a scratch-build using Northeastern wood(?) We'll never know for sure. There is no underbody detail, the truck "bolsters" are merely pieces of basswood, and roof "hatches" are simply wood squares, held in place with what I believe are HO scale track spikes.
I replaced the missing roof braces and used "Red Oak" (which tends to be brown-ish) stain to kind of blend in the old with the new:
I may go ahead and stain those hatches as well...
It does have a certain "old school" charm, and I only had to pay 5 bucks for it, so what the heck...
Mark in Oregon