[agere_contra]

That my friend is simply what we would expect from a "1961 Pixellating Typewriter". Very common. Nothing to worry about.

You are dead right. The image has been doctored with a digitally-added number. Who's B/C was it copied from? Someone in the range 10642 to 10649?

[bolobaby]

Very nice find.

Anti-aliasing around only one “1”?

I don’t think so.

[bolobaby]

Oops. I take back my original comment.

If you look through the entire PDF, you see LOTS of places where the scanning program chose to anti-alias something when similar sections and/or characters had not been.

Just go the the doc. You see it on lines, letters, and even parts of the signature.

I’m actually chalking this up to variations in the way the scanner took in and digitally processed the document.

[stylin19a]

I’m not so sure that “4” is really a “4”. Looks more like the other “1”s.