IBM never made a Selectric I or II with a proportional font ball, period. Only the IBM Executive had proportional spacing for characters. The IBM Selectrics only came with many varied but in the end, MONOSPACED characters.
dvwjr
I'm not going to argue because you are likely correct. But the font did not look like Courier when you used it...that's as much as I know. I know fonts at least. Spacing I'll defer to you.