Is this a Williams tube or a Mellon tube? I have seen ONE or these, and they used to be more numerous than pocket change, at least the ones that no longer worke

Is this a Williams tube or a Mellon tube? I have seen ONE or these, and they used to be more numerous than pocket change, at least the ones that no longer worked. Unused they were treated like fine crystal, used like empty beer bottles. I wanted to hook one up in a tv to see a 1" movie, or maybe a 3/4" movie with the aspect ratio but the refresh rate was really slow, so it was useful as a memory.