"Lets look at that superscript TH again. If it was converted in scanning, it would always be converted in scanning & one of the docs has it both ways."
I believe IBM had a selectric ball that had to be exchanged with the normal ball to make that th and that would seem to be rather much for a memo not for official files(freeper thread fom last night was info source.)
I don't know how a program that converts an image into PDF treats characters. I believe that old fax technology made conversions of characters to code, cuz it sped up transmission speeds.
I saw one post, in one thread where someone said they had a "th" char on a daisy ball, but there are so darn many threads about this today, I'd be at a loss to find the post again.
Seeing the differences in the signatures finally convinced me, though I was trying to poke holes in the story for a good portion of the day today.