Agreed. The "original" seemed to use a proportional font (with a very narrow "I"), while the fake seemed to use a mono-spaced non-proportional (with a wide "I")

Agreed. The "original" seemed to use a proportional font (with a very narrow "I"), while the fake seemed to use a mono-spaced non-proportional (with a wide "I"), which seemed more plausible to me (for a typewriter).