Actually, it was /most/ typewriters. Having a numeral one (1) key on a keyboard was something brought about by computer input keyboards (where there did, indee

Actually, it was /most/ typewriters. Having a numeral one (1) key on a keyboard was something brought about by computer input keyboards (where there did, indeed, need to be a distinct numeral one separate from lower case-ell (l)). But for most typewriters, the ell (l) key also served as the numeral one key.