The IBM font lists (Delegate or maybe one of the Prestige variations) look more likely. It's hard to tell without the full alphabet sample. These are in the last pages (175 or so) of the IBM manual kj posted on her diary. (I'd link but I have got to get some sleep soooon.)

I was trying this with the standard PC and MAC fonts, and since they don't match I don't believe the computer type theory.