A classic 1959 commemorative from the Soviet Union honoring A.A. Voskresensky (1809–1880), a pioneering Russian chemist and mentor of Dmitri Mendeleev. The stamp features a finely engraved sepia portrait framed by an ornate blue decorative border, with the anniversary dates 1809–1959 prominently inscribed. Issued by Почта СССР (Post of the USSR), the 40-kopeks value pays tribute to one of Russia’s foundational scientific figures. A desirable mid-century scientific-thematic issue, sought after for its clean engraving and historical relevance.