NOS delta gun mystery CRT

[Turle]

Hey everyone. So I was snooping around in ewaste today and came across this tube lying out in the open. It would appear to be some type of 19” delta gun tube. It still has the cover on the tube pins. It’s definitely spent a great deal of time outside as evident by the rust and dirt.

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I put it on the tester and it tests great, like a new tube. However it’s not without problems. For starters I have no idea what tube it actually is since the label is gone, it looks too squared off to be a 60s tube so I’m guessing it would go in an early 70s hybrid? If anyone knows what kinda of sets this would belong in that would be appreciated thanks.

Also the aqua dag is missing on the outside, would conductive paint work as a replacement?

And finally there’s some scuff marks on the face that make the front look kinda cloudy, is there any reccomended affordable polishing methods to remove light scratches such as these? The deeper scratched I’m not too worried about.

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Thank you for reading all help is appreciated!