I went back to the NASG page(s) and have come to realize that this is actually their F9. There's a couple of odd mushroom-shaped items on the back end of the roof:
...dunno what these are supposed to be; they aren't on the Enhorning F7, (or any F9 I've ever had in other scales) but do show up on both F9 photos on that site.
There is also a link to a review from the December 1962 S Gauge Herald, which speaks of the pick-up issues and mentions that earlier models had aluminum wheels, while later releases had wheels of brass. My sample has the aluminum ones.
More S scale history...
Mark in Oregon