This is a semi-hollow body Harvey Thomas Deleitar from 1967. Thomas was an eccentric Washington luthier, the Deleitar was probably his most conservative design, shaped a bit like a DuoSonic. The Deleitar was also available in cheaper solid body version.
This example has had the orginal finish removed, but the owner thinks that it was black. It has the original German hardware, probably Framus. A Mosrite style zero-fret and string guide.