Very nice rare stamp.

After the Assassination of Archduke Franz Ferdinand in Sarajevo, the Hungarian prime minister István Tisza and his cabinet tried to avoid the outbreak and escalating of a war in Europe, but their diplomatic efforts were unsuccessful. Austria–Hungary drafted 9 million (fighting forces: 7.8 million) soldiers in World War I (over 4 million from the Kingdom of Hungary) on the side of Germany, Bulgaria and Turkey. The troops raised in the Kingdom of Hungary spent little time defending the actual territory of Hungary, with the exceptions of the Brusilov Offensive in June 1916, and a few months later, when the Romanian army made an attack into Transylvania, both of which were repelled. In comparison, of the total army, Hungary's loss ratio was more than any other nations of Austria-Hungary. The Central Powers conquered Serbia. The Eastern front of the Allied (Entente) Powers completely collapsed. The Austro-Hungarian Empire then withdrew from all defeated countries. On the Italian front, the Austro-Hungarian army made no progress against Italy after January 1918. Despite great Eastern successes, Germany suffered complete defeat on the more important Western front. By 1918, the economic situation had deteriorated (strikes in factories were organized by leftist and pacifist movements) and uprisings in the army had become commonplace. In the capital cities, the Austrian and Hungarian leftist liberal movements (the maverick parties) and their leaders supported the separatism of ethnic minorities. Austria-Hungary signed a general armistice in Padua on 3 November 1918. In October 1918, Hungary's union with Austria was dissolved.