NOS delta gun mystery CRT

[Yamamaya42]

All joking aside, it's extremely unusual for a “GOOD” CRT to be tossed out like that, so it's suspect that it may be a dud or faulty, and as old_tv_nut pointed out, the gouges on the face are a risk factor, accepting that risk, obviously the first thing to do is slap a test jig and see if you can get a good display out of it.