@mwichary The earliest I saw was the (Navy sourced?) Bodoni vector font, which we digitized at U of Toronto for nroff on the Versatec and later resurfaced in the falsely attributed "Berkeley typesetting software". That font, or possibly someone else's digitization of it, appeared on countless graphs in science papers all through the '80s and early '90s. It was only 100dpi but was free and available.