I'm going to guess it was an IBM selectric using the pica72 font typeball. http://munk.org/typecast/2013/11/03/gp-ibm-selectric-typeball-catalog-font-styles/ h

I'm going to guess it was an IBM selectric using the pica72 font typeball. http://munk.org/typecast/2013/11/03/gp-ibm-selectric-typeball-catalog-font-styles/ http://munk.org/typecast/2013/11/03/gp-ibm-selectric-typebal... Bitstream has a $$ font called Pica 10 Pitch if you're interested. https://www.myfonts.com/fonts/bitstream/pica-10-pitch/ https://www.myfonts.com/fonts/bitstream/pica-10-pitch/ n.b - the typist used lower-case L instead of the number 1.