Soviet Philatelic Association was a business run by the Soviet Union authorities in the field of philately.
Registered letter sent from Moscow to Berlin that contained philatelic materials. It had special marks and an international trading tax stamp (placed on the envelope back) issued by the Soviet Philatelic Association
Russian Bureau of Philately
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Russian Bureau of Philately was a special organisation under the People's Commissariat for Posts and Telegraphs of the RSFSR in 1921–1924. This was the first Soviet government agency in charge of all
Soviet Philatelic Association
…Philatelic International Russian Bureau of Philately Soviet Philatelist…
RSFSR definitive stamp issued by the RBF order, 1921
Semi-postal stamps of the Ukrainian Soviet Socialist Republic issued with assistance of the RBF, 1923