Hi, I believe that this symbol, as stated in the thread, is the production symbol for the USSR 1958 glass designs that they provided for the Brussels World Expo. Scandinavian and Czech companies provided similar (but different) distinctive symbols for their wares, Russian glass is not well researched at all really but they did have some facilities at this time for art glass production, though on a much smaller scale than in Czechoslovakia. This is probably why they held the big Moscow 1960 exhibition of Czech glass, to try to develop their own production which did not really take off. There are a couple of books on Russian glass but I do not have them. Also, as it is federation in the name, it may not even be modern Russia, as we know it, though I am pretty certain these two are not Czech and are from the "federation", Czech glass production always was Czechoslovakian at this time, not federation glass or Russian.
Robert (bOBA)