All the Scouts were made in the 50's. Not sure about all the numbers you're describing. It would probably help to post photos. I have a 3-1/2" Scout and it has the same number (13-633 1/2) under the rotating base. My hunch is the same base was used for the 3-1/2" and 4" models, and possibly the 4-1/2" model, although that one had a reverse dynamic jaw for some odd reason, so maybe not. I don't know anything about the stylized "[N]" you're describing or the stamped "5" (dynamic jaw) or "6" (top of base), but they are probably part numbers, something esoteric to assembly. Mine has a "12 1054" on the dynamic jaw and a "12 1047" on the static jaw, for example.
I can see that you probably Googled 'Wilton Scout' and after you saw a bunch of unhelpful eBay ads and other stuff you saw a link to this GJ thread, but if you go into the main Vises thread here on GJ and search on 'Wilton Scout' you will find a lot more examples and information. I posted mine
here on that thread, which prompted some other examples to be posted followed by some good information, including a post from me in which I summarized and posted a link to even more information from one of our best vise researchers.