The orignal paper does not have a revision table and that would prove it. That may be found sometime.
the original paper doesnt have a revision table? then what was scanned?
Some other set of palns with a revision table was scanned and then revision table cut and pasted.
However, since there were 200 sheets that needed to the alteration, that revision table had to be dublicated and altered to appear slightly differently. Here is where the photoshoppers screwed up.
They cut and pasted the contents of the cells into separate files having the cell size or slightly smaller. Then altered those cell contents in a variety of ways getting a different look. This is where the anomalies were generated. They lost track of them and created an abberation that was not a character of the alphabet by reducing size, resolution or other graphic factors. But, they were working at a small scale to make the work faster. Therein they did not notice the anomalie.
Placement of the altered initials with automation such as "quick keys" in identical revision table files with empty cells can be done easily and takes the bulk of the difficult work and gets it done very quickly. So they did not even notice what was being placed in the cells.