This is the only known Russian threadless insulator style. It has been assigned to CD 546 on November 2024 and is listed on the NIA site. I know of 5 examples that have been found and 2 are in USA. My contact in Russia has recently turned 18 years old and can no longer acquire these because of conscription. What I understand is that these were rescued from an ancient building in Kolomna, Russia. No other units have been located at this time and it is unknown where the other 2 examples which have damage are (possibly now in Belarus). I will post more information about these if I get any. This was updated 3/24/2025