Reply #5: This might help

[HFishbine]

The Selectric II had a Dual Pitch option to allow it to be switched (with a lever at the top left of the "carriage") between 10 and 12 characters per inch, whereas the Selectric I had one fixed "pitch".

The Selectric II had a lever (above the right platen knob) that would allow the platen to be turned freely but return to the same vertical line (for inserting such symbols as subscripts and superscripts), whereas the Selectric I did not.

As for the "theories" about the font:

Both Selectric I and Selectric II were available in standard, medium, and wide-carriage models and in various colors, including red and blue as well as traditional neutral colors, and both used the same typeballs, which were available in many fonts, including symbols for science and mathematics, OCR faces for scanning by computers, script, Old English, and more than a dozen ordinary alphabets.

http://en.wikipedia.org/wiki/IBM_Selectric_typewriter
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The world's most popular typewriter in 1972 was perfectly capable of creating superscripts.

BONUS: For a good laugh, click on this link to the Selectric Typewriter Museum (yes, there really is one. I think it's operated by a Democrat): http://www.selectric.org/selectric/index.html