That is a Russian version of one of the most common miniature 9-pin tubes used in preamp applications. The best versions of that are widely considered to be the NOS German tubes made by Siemens and Telefunken. Those NOS versions are also frequently counterfitted, and sometimes re-branded by other tube manufacturers because they can command a high price. If you are going to buy good tubes in that family it is best to buy from a reputible dealer. I think the Russian 6H23 version of this tube is a slightly higher output and not necessarily applicable in all applications of the 6922 family. Perhaps someone who knows better than me could chime in and assist.
Marco
Marco