Sorry not the RSL answer but thought I'd add my additional two-cents regarding the "Star" marking. My earlier post may have not been clear so I'll try to clarify regarding the “Star” marking on Tula produced weapons. A lot of the terms are thrown around loosely and they end up getting twisted around. Russian authors also use different terms with different definitions, which further confuses matters, not to mention things can get lost or twisted in translating a lot of these things.
Like mentioned previously the “Star” marking is synonymous with Tula. Other countries have used a star marking but that’s another story. The “Star” marking in question here is governed by the OTC, which BTW has a few different definitions. Some authors will call this marking a Technological hallmark, while other will call it an OTK marking. Both would be correct if used in the proper context but OTK is a more recognizable term. Then there is the AC if we look further back in history at Russian firearms/markings.
The Department of Technical Control or Technical Control Services ensures quality control and that weapons are acceptable for service. The OTK stamp used indicates that the parts were “manufactured” within proper tolerances. Often OTC and OTK will be used interchangeably (and translation can add to that) but again the context being used is important. People like to separate the governing body and the stamp used, but often that gets twisted. The hammer and star are both considered OTK markings or technological markings, and they are stamped on various parts. OTK markings are completely different than inspection (provisional, definitive) markings and other specific proofs (e.g., Circle K, Circle Y, etc). Also, different arsenals used different markings during different timeframes and then there are Arsenal marks. Here are a few examples of the “Star” marking. If others have information supporting or against, I’d be most interested. I think in Russia things like this are almost common knowledge but to us they are not.
TT with multiple OTK stamps on the various parts and I posted a 1895 with various OTK markings as well.
1895 Nagant Cylinder: The markings are as follows going clockwise - starting at 7 o'clock: Serial Number (HM525), Inspection Marking, OTK Marking (Star).
TT Magazines: Different sizes of "Star" OTK markings for different production years. The pistol also has different sizes depending on production year. Last pic is TT magazine with Izhevsk OTK marking.