1) The M is pre-filled on the form. The attendant just has to add A or P.
2) ??
3) That’s the scanning software used to put the document into a PDF.
4) I suspect that the stamp used read Aug 8 196 and then the attendant writes in the 1.
5) As in 3 above, you can’t look at pixelation from a scanned into PDF copy. You would need to look at a high-definition picture of the document in order to do pixel analysis - and even then pixelation only matters on digitally altered documents. It doesn’t matter on printed documents that are then scanned.
You sound like a guy trying to defend his own handiwork.