I'm neither a typewriter nor font expert but I think it's a monospaced font and since IBM is mentioned maybe it was from an IBM Selectric typewriter? I've seen

I'm neither a typewriter nor font expert but I think it's a monospaced font and since IBM is mentioned maybe it was from an IBM Selectric typewriter? I've seen font files based on that before, a Google for IBM selectric font looks not totally dissimilar. Maybe that helps?