- Austrian State Treaty in force July 27, 1955 (Duchy: 1156, Austrian Empire: 1804, First Austrian Republic: 1918–1938, Second Republic since 1945)
27 Hunio 1955 (Duchy: 1156, Imperio iti Austria: 1804, Immuna a Republika iti Austria: 1918–1938, Maikadua a Republika manipud idi 1945)