A striking commemorative issued by the Soviet Union in 1966 to mark the International Congress of Mathematicians (ICM), held in Moscow. The design features elegant mathematical symbols and a stylized globe, symbolizing the unity and universality of mathematical sciences. Printed in rich brown-black tones, this 6 kopeck issue reflects the USSR’s strong tradition in mathematics during the mid-20th century. Highly desirable for collectors of science, mathematics, and Soviet thematic material, this stamp remains a notable representation of intellectual history.