What is it about the fonts that you are referring to, particularly in light of Salamander’s acknowledgment? We would like any insights about the fonts that you might offer.
I can't answer that question but it looks a little too consistent to me. I have a 1964 document printed by the City of Boston and the printed text has darker and lighter portions within the same font. This is particularly true nearer the sides and edges of my document. I don't see that on the photograph of the document in this thread. I have to agree with bvw in post 1848 so far. But my analysis is woefully inadequate and anecdotal so I will stay agnostic and hope someone does a better job.