I think we're starting to drink the Kool-aid ourselves. I'm not sure waht was available in 1972-1973, but in 1975 I had an IBM Selectric that how proportional Times Roman serifed font.
>>in 1975 I had an IBM Selectric that how proportional Times Roman serifed font.<<
According to http://encyclopedia.thefreedictionary.com/typewriter, IBM didn't produce a Selectric with proportional spacing.
Do you have any samples from anything written on that machine?