It would appear that the smaller th is a differant font. Possibly a DU forgery. Or an error was corrected by tying a superscrpt th on another typewriter with a smaller font, so thay it would fit. The rest of the document only proves the CBS docs are forged. The letters are not perfectly even as some are slightly higher or lower than others. A typewriter does that, especially the well used ones on a military base, a word processer and laser printer never does that.
Where are images of the documents. Somehow I have missed a link to view them.
Also, how big is the paper? Back in those days, military paper was 8x10 1/2 rather than 8 1/2 x 11. And even if these are copies, the paper edges of the smaller paper should show up on the xerox copy.
But, an IBM Executive doesn't; it has the most stable platen I've ever seen. We had two of them, but since I don't type, my wife would have to be the witness; she could center using it and left/right justify, but I don't remember about the superscript although I believe it had the capability.