See my reply to MineralMan. MS Word does different spacing in the same example of "iiiii", "ooooo", "wwwww", "mmmmm".
It's probably that nasty Kerning that does it. The IBM didn't have it. MS Word does.
Here's how dumb these forgery folks are. Outside of even doing an ounce of research about typewriters back in the day, the obviously didn't do ANY research on monotype typography (fonts) that are available for the computer. If so, they would have been far more successful in their forgery.
Too bad they're just plain stupid.