Depicts a carved, ornate table detail on the left side, showing the pendulum designed by Loránd Eötvös in 1898. To the right of the pendulum, in the upper right corner, the portrait of the scientist in his later years is displayed within an ornate frame. Beneath the portrait, (placed diagonally and rising towards the right) Loránd Eötvös' signature can be read. In the lower right part, two rows of years indicating the jubilee anniversary are placed.

The Eötvös pendulum, also referred to as the Eötvös balance or torsion balance, is a highly sensitive device utilized for detecting minute fluctuations in gravitational force. Constructed with a horizontal rod suspended by a delicate wire or fiber, featuring small masses on its ends, the pendulum is capable of rotational movement in a vertical plane. Variations in gravitational force, stemming from changes in subsurface rock density or the presence of underground formations, exert torque on the pendulum, inducing rotation. By gauging the extent of this rotation, scientists can ascertain both the magnitude and direction of gravitational anomalies, facilitating the mapping of subterranean geological structures, identification of mineral reservoirs, and examination of the Earth's internal composition. Widely employed in geophysical research, including oil and gas exploration, mineral prospecting, and studies on tectonic dynamics and crustal deformation, the Eötvös pendulum remains a pivotal instrument in contemporary geophysical investigations.

Depicts the denomination in the center. Positioned to the right of the denomination is the year of issue, while the mint mark (BP) is visible on the left side. Surrounding the edge of the coin in an incomplete circle is a decorative motif. Above, the country name (Hungarian Republic) is arranged in a semicircular fashion. At the lower center, the designer's privy mark (KYY) can be found.