I must have had it since 1969 or 1970. It was a sample neon made by Hivac Ltd.
I found it while repacking all my electronic components and modules prior to downsizing, many not touched since the 1970s.

While working on an old record player. The motor had stopped. I could not tell whether the 4-way power strip into which it was plugged was working or not as the neon wasn't illuminated. The fuse was OK so it had to be the neon.

Having only seen the Hivac sample a day or two earlier, I retreived it used it to replace the duff one. Perfect!

I never chuck nuts and bolts away .... or sample neons. It pays off eventually.

--
Mint 20.04, kernel 5.4.0-42-generic, Cinnamon 4.6.7
running on an AMD Phenom II X4 Black edition processor with 8GB of DRAM.