Very interesting! Are the internal pins (not the "C" shapes) coated in glass? If yes then the tube probably contains gas. If not, then it might be vacuum.

Where did you find it? Maybe that can help us figure it out?

Cheers
Jens

On 2019-04-09 9:25 p.m., Nicholas Stock wrote:
Anyone have an idea what this is? 4 pins. Doesn’t glow next to a plasma globe 
and doesn’t have any distinguishing markings on the base except some hand 
written numbers.....Appears to have two C shaped wires connected to each pair 
of pins with a small gap between the electrodes.....

Nick



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