Issued to commemorate 100 years of the first Russian postage stamp (1858–1958), this attractive Soviet set illustrates the evolution of the Russian postal system—from early mounted couriers and horse-drawn mail coaches to modern aviation mail transport. The series highlights key milestones in communications history, combining historical portraits, transport scenes, and decorative imperial-style typography. Because of its historical theme and appealing multi-design presentation, the set is popular among both thematic “postal history” collectors and USSR commemorative specialists. Well-centered complete sets in fine mint condition remain consistently collectible and widely traded in classic Soviet philately.