Of the signed originals I have seen, like you, I believe all of them were done in either ink or paint. I only used the pencil signatures since we know when those signatures were done down to the month in Pat's timeline and I am making the assumption that when Nagel modified his signature in pencil, it is close proximity to the way he would have signed originals in ink or paint.
For the signed in screen signatures, I know Nagelite got to hold the templates all at one point during a visit to Wasserman's studio. It appears they just used the same template over and over again for several series of pri=ints, only changing it a few times over the course of the manufacture of the posters over the years. I used to know exactly with which print the change over occurred, but now that I have redistributed all of my signed in screen prints, that change over is starting to get foggy.
[I believe you already know this, NagelCollector, but just for everyone's education]
I recall only three signatures used for the signed in screen images: the block one (as seen on "Mirage Ship") was used through until, I think, about the time of "Yochum-Kay" and then the one that I see on "Lorriane" looks like it was used all the way through to "NC/CN 2: Palm Springs Life" and then they transition to the last one with "NC/NC 3: Sushi Girl" and that one appears on everything thereafter including the lithos.
Re Gunwald, it's interesting to note the difference between the signature in the screen and the pencil signature.Personally, I've never seen an original with a pencil sig on it. That said, when someone can't remember where they got a $10k painting from, that's a huge red flag.