Have you ever heard of Superior Truck and Tractor Manufacturing Company? I certainly never had and apparently neither has Google. My buddy Dave shot this photo at a Ritchie Brothers auction in Maryland last month as proof that the company did indeed exist at one point.
Clearly the truck cab is based on the venerable International S-Series. As with previous International cabs like the Comfo-Vision, the S Series cab provided a starting pointing for many niche truck companies including Hendrickson and the last incarnations of Diamond-T.