You gotta tone down!
There was no bashing at all.. a statement was made that it's probably a home made arcade machine, and it was confirmed with your picture.
It can be ANYTHING in there.
It could be a monitor, a TV or even a PC monitor (in the last 2 cases, the plasic cover was removed to make it fit!)
There's very little we can tell you. Your only alternative it to pull the monitor, and write down any sticker information you see on the tube and on the chasis.
I got a question for you. Why do you care what this monitor is? The only reason one would ask is in order to either modify it or tune it. In either case, you'll need to remove the monitor.