1 HRK

Front: Ruđer Josip Bošković (1711–1787), Croatian physicist, astronomer, mathematician, philosopher, diplomat, poet, theologian, and Jesuit priest. He is best known for his atomic theory and his work in astronomy and optics; he served as director of optics for the French Navy and was a member of learned societies across Europe. His portrait is accompanied by geometric diagrams representing his scientific work, including orbital mechanics and astronomical calculations. The note displays 'REPUBLIKA HRVATSKA' vertically on the left, the Croatian coat of arms (checkerboard shield) at upper right, and the denomination '1 JEDAN HRVATSKI DINAR' below the portrait.

Back: Zagreb Cathedral (Cathedral of the Assumption of the Blessed Virgin Mary), the tallest building in Croatia and the most monumental sacral structure in neo-Gothic style southeast of the Alps. The twin spires, standing at 105 meters, are shown with the cathedral's ornate Gothic revival façade. Construction began in the 13th century; the building was extensively rebuilt in neo-Gothic style by Hermann Bollé after the 1880 Zagreb earthquake. The reverse includes decorative geometric patterns and the text 'REPUBLIKA HRVATSKA' vertically along the right edge, with 'ZAGREB 8. LISTOPADA 1991' (Zagreb, October 8, 1991) along the left margin.