Zenith Super Heterodyne Car Automotive Radio Receiver Model 460 Untested Parts. This unit is untested. I believe that another part is needed for a complete unit. The Zenith Model 460 is one of the first automobile radios, featuring a separate chassis and control head, and it was designed to operate without a separate generator or battery. It was introduced in the 1930s and is notable for its innovative design and functionality in early car audio systems.