That is a straw man. The question Irey presents is of different fonts.
That's what Irey claimed ~ not that there were DIFFERENT FONTS.
There is a clear average size difference ~ it's minute but it is apparent to anyone familiar with the world of manually typewritten records.
You get a worn out electric you can get similar variations, but they'll be more uniformly applied, and the row alignments will be crisper.
One Freeper above mentioned that if this document is actually drawn from a data source, in part, that existed as a microfiche image, the simple act of using that microfiche could have distorted the character images at the margins of visibility.
We have earlier threads that deal with the effect of fixed focal length lenses on documents like this. There's no reason to not go back and read them!