Different construction than your typical 845 with that flat bottom glass. No sign of a getter either. A quick search on ebay didn’t turn up anything similar.
Maybe Linlai.
It had no label in the glass.
What happen to the label ?
How do you know its a 845?
It had no label in the glass.
What happen to the label ?
How do you know its a 845?
Like astoufer already pointed out: There's no (provision for spreading) getter material. The combination of no pinch, long internal leads to the tube system, and no spacer at the top seems a bit odd to me (prone to vibrations?).
Could it be some sort of non working demonstration model?
Could it be some sort of non working demonstration model?