I recently repaired an IBM Selectric III typewriter, which has been a joy to use. For all of the old typewriter aficionados out there, at the bottom of this post is a 600 DPI scan of one of the entire font sets- for Prestige Pica, 10 pt.
The set contains three keypresses of every lowercase letter, every uppercase letter, every character, and every number.
A quick image of the font ball in the typewriter. The "96" refers to 96 available characters.