VFO or slave to the Hallicrafters SX-117
I had the privilege to own one of these built like a tank transmitters. I bought it and the matching receiver the SX117. I was first licensed in 1967 and saw these and had to have one. So 43 years later I saw it on Ebay and had to have it. These radios are built so well they usually dont require much restoration . If you get a chance to try one dont hesitate.