The S-750 is a 30" tractor feed plotter that uses a tangential head and runs at less than 4" per second. It is pretty much the king of plotters for sandblast rubber but other than that is largely out of date. Most were made in the 1980s. We sold one about three years ago along with a 15" plotter, a Gerber Sprint console and an LMK card for interfacing it for $800.