I acquired this as part of an estate sale. I don't know what it's meant to display, but it's clearly an oscilloscope type display. Looking inside, one can see what look like four epoxy op-amp "blocks"; one is clearly hand-labeled "horiz". I disassembled it enough to see that two of the blocks are factory-labled "high voltage opamp". I think that it would be possible to make a "generic" oscilloscope out of this.

The front panel is 5.25 inches by 5.75 inches.

The "J1" connector on the back is the AC power input, and it "probably" accepts 120 VAC. I think the red blocks visible in slide 4 are the power transformers, but I didn't apply any voltage to test; I'd suggest bringing this up on a Variac rather than just applying the full 120 VAC to it.