Here in Texas, a classic vehicle can be licensed with license plates from the vehicle's year of manufacture. The 1968 Texas Truck Tags have a black background with white lettering. I am currently looking for a decent set for the truck. When the truck is back on the road, I want it registered with classic plates.
The 1968 car plates are even cooler, though. That was the year of the San Antonio Hemisfair. So the 1968 Texas car plates have HEMISFAIR on them. These old plates are cool, because they were single year plates.