This 1957 Soviet stamp commemorates the International Geophysical Year (1957–1958), with a focus on geomagnetism. It depicts the non-magnetic research schooner Zarya, used for studying Earth's magnetic field without interference from magnetic materials. A marine magnetometer is illustrated in the lower left, symbolizing scientific instrumentation. The stamp is inscribed with "Геофизический год" (Geophysical Year) and valued at 40 kopecks. A notable issue for collectors interested in polar research, science, and Soviet maritime achievements.