Please Identify this Russian Tube

Here are three GM tubes. Small glass tube on bottom with nipple is (I believe) CI-22BG.
Middle tube is standard SBM-20.
Sovtube sent me the large top tube as a CI-22BG, but it isn't.
Anybody know for sure what it is?
According to a few sighted friends, it has the same C reverse N 22 designation as the small tube.

looks like an SBM-19/STS-6...

Thanks for the look and answer.
Just found out that the tube is 220mm long and 19mm diameter. That helped. It actually does have a Sirylic "SI-22" designation, which is why it got shipped in place of a SI-22BG. It's actually a "CI-22G" or SI-22G.
Same operating voltage, 9 to 13 megohm anode resistor, and almost three times longer than the tiny CI-22BG tubes. Too bad Sovtube didn't make the same shipping error the second time when I ordered two CI-22BG tubes. Sigh.