Old nerds will instantly recognise these as the numerals used on the covers of the James Blish Star Trek adaptations. All my own vector recreations, of course. Still technically a WIP, but I may or may not return to these later.
I think the covers used at least two different typefaces, both considerably stretched. Note the different serifs on the 1 and 4 (except the 1 used on book 12). I've been trying - without much luck - to identify the typeface(s) used for the numerals on the covers of the old James Blish Star Trek books. It's a highly stylish fat face Didone with some unique qualities I haven't been able to tie to any particular font. The '4' is a particular curiosity.