[somat]

The original typewriter had no "0" or "1" you were expected to use "I" or "O" in place. I suspect an authentic typeface should have trouble distinguishing them.

and having said that, forget authenticity, I really appreciate typefaces that make an effort to distinguish all characters.

[dsevil]

I was taught to use lowercase letter L for the digit 1 though I did see typewriter samples using the capital I.