Typewriter Typefaces: Pica vs Elite, an explainer https://www.youtube.com/watch?v=qwCD69jUPps

Pica machines (12 characters per inch) will usually have a scale up to about 80-84.

Elite machines (10 characters per inch) will have a scale up to 100.

On Olympia machines, script only comes in Elite sizes (scale to 100 on platen).