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It's not Courier, though. Similar, but the g and numerals are different.

I'm going to guess it was an IBM selectric using the pica72 font typeball.

Bitstream has a $$ font called Pica 10 Pitch if you're interested.

n.b - the typist used lower-case L instead of the number 1.

Yeah, looks very similar to the Courier font. Thanks!