KoNickon
Nick Merritt
It's been a while since I've shot Kodak 120 with a red window camera, but I recall the main problem with their backing paper is not readability but rather trying to figure out their "1." I recall that it's just a vertical | rather than a proper 1 -- 2 is clear enough, but by then you've missed the first frame, of course. No such problem with Ilford!