Stuart Dixon sent in these slides from a 1975 IBM presentation. They’re posted in a collection featured at Square America; the only information listed is the tagline at the top:
"It’s 1975 And This Man Is About To Show You The Future (Scenes From An IBM Slide Presentation)"
Have a browse through the rest of the collection, there are some really nice slides in there. I particularly like the information design examples like the last image pictured above. As far as I can tell much of it is set in Helvetica, but there seem to be a couple other faces floating around in there. The segmented slide (4th one down from top) would be great as a massive wall hanging. Someone needs to email Square America and see if we can get hi-res versions of these; many would make great posters.