This thing is pretty unique. In fact I could only find a few mentions of it on the web. But! I have the correct cable for it and I believe it's an EGA TTY RGB crt.
It has two composite inputs as well as a built in tv tuner, and one composite output / headphone jack as well.
The input switcher is a bit fiddly, you have to press it a few times to get it to switch, but other than that, the crt looks fantastic / very bright and great color.
Would be a great piece for someone building out an OG XT gaming setup.
Asking $200 plus shipping, or local pickup in Portland Oregon..