I have never seen an SW mentioned by All Nation. For sure they did not make it in later years from the 70s on when I have catalogues.
The SW was a rare prototype. This is not an SW-1 or any of the SW numbered later switchers. Not many prototypes were made and I think Pre-WWII. So maybe there was not much interest in it as a model. The All Nation/General Models NW2 represents the earliest versions without louvres on the hood. Later near the end of production, they did get louvred doors on the hood.
By the way, I have never measured my All Nation shells to know if they are wide or by how much, it was just a rumor I have heard
I did kitbash an All-Nation NW2 into an SW-1. That was bit of a project. I had to cut the entire cab and hood off the frame and reposition it in addtion to shortening the hood.