The 28-475x is essentially a standard late model USA-made 14" band saw with a blade de-tensioning device. Delta's parts illustration BS-2G-1D, 01-13-04 would cover it. The de-tensioning device looks like it could give trouble. Chances are it comes with poly tires, so figuring on replacing them.
How well it runs depends on what the owner chose to buy as to stand, switch, and motor. If it was someone looking for cheap, then don't expect much.
Used parts for that saw should be readily available because it was a popular model. Many of the parts will interchange with those Delta saws that came out in 1939.