Mystery tube

[marshall2020]

Mystery tube. I don’t remember anything about it.
It has 4 seams on the top.
15 is engraved on the bottom.
14mm plates.
Round thick halo
All the paint is missing.
Thanks for your help!

 

[CDawg]

Matsushita or Siemens. Need more pics.

If it has two posts connecting the ring getter then Siemens. If it has one post for the ring getter Matsushita.

Most likely Siemens from what I can see.