Issued by Yugoslavia in 1961, this 25-para commemorative stamp marks the Međunarodna Konferencija Nuklearne Elektronike held in Belgrade. The design features a stylized atomic model encircled by blue laurels, symbolizing scientific cooperation and peaceful nuclear research during the Cold War era. Its clean modernist layout reflects the strong scientific identity of Yugoslavia in the early 1960s under Tito’s non-aligned program. A desirable thematic piece for collectors of science, atomic energy, and conference commemoratives.