I'm making a clock, using Russian Numitron tubes, and would like to mount the digits in some authentic Russian cartridges. The base of the tubes is just under 10mm so something with that neck size would be great if there are any larger calibres kicking around.
If not anything reasonably big would do.
I'd love to mount the whole thing in a Russian magazine but I can't see me getting one cheap

Please let me know what you have and what you'd like for it, 6 or more would be great.
Cheers
Dean