Soviet Union - Stationery postcards

Soviet Union - Stationery postcards
1933, two booklets, Treasures of Moscow Kremlin Museums, first one is containing 6 cards of the treasures from the Grand Kremlin Palace (series II), the other one – 12 cards of the treasures from the Kremlin Armory (series III), all are intact, first one with insignificant cover wearing, still VF and rare, only a handful intact booklets remained, Est. $300-$400