1: Nikola Tesla (1) 80th Birthday Anniversary (1936)
2: 1936 Red Cross Charity: Prince Pavle (2)
3,4: 1937 Child Welfare: Princes Tomislav and Andrew
5: 1937 Establishment of Little Entente (3)
6-9: 1937 Airmail Set
10: Balkan Entente (4) First Anniversary (1937)
11,12: Child Welfare (1938)
13: International Aeronautics Exhibition in Belgrade (1938)

Miniature Sheet no.1: First National Philatelic Exhibition in Belgrade (1937):

1-4: Railway Workers' Hospital in Demir Kapija Fund (1938)
5-8: 9th Balkan Games in Belgrade (1938)
9: 1938 Child Welfare Set with Overprint 'SALVATE PARVULOS'

1-5: Serbian Postal Service Centenary (1939)
6-9: Child Welfare (1939)
10: Battle at Kosovo Polje (5) 550th Anniversary (1939)

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(1) Nikola Tesla (1856-1943) was an inventor, physicist, mechanical engineer, and electrical engineer. He is often regarded as one of the greatest engineers of the 19th century and 20th century and he was a pioneer of electromechanics. He was of Serb descent and, while conducting his work in the United States, became an American citizen in 1891.
His patents and theoretical work still form the basis of modern alternating current electric power (AC) systems including the polyphase power distribution system, with which he helped usher in the Second Industrial Revolution. After his demonstration of wireless communication in 1893 and winning the "War of Currents", he was widely respected.

(2) Prince Pavle of Yugoslavia (1893–1976) of the Royal House of Karadjordjevic was regent of Yugoslavia for his nephew, King Peter II. He was married with Princess Olga of Greece and Denmark in 1923.
He took the regency on October 9, 1934 after King Alexander's assassination in Marseille and ruled the country until he decided to sign the Tripartite Pact in Vienna on March 25, 1941. Because of his decision, massive demonstrations took place in Belgrade and, after this, his nephew, together with a group of pro-English officers and middle class politicians, made a coup d'état on March 27, 1941. General D. Simovic became prime minister and Yugoslavia backed out of the Axis sphere in all but name.
Although the new rulers opposed Germany, they also feared that if Hitler attacked Yugoslavia, the United Kingdom was not in any real position to help. For the safety of the country, they declared that Yugoslavia would adhere to the Tripartite Pact. However, Nazi Germany invaded the Kingdom of Yugoslavia anyway and the royal family escaped abroad, Prince Pavle included. For the remainder of the war, Pavle was kept, with his family, under house arrest by the British in Africa. Pavlel died in Paris without ever returning to Yugoslavia.

(3) Little Entente was the name of an alliance formed in 1920 and 1921 by Czechoslovakia, Romania and Yugoslavia with the purpose of defending against the Hungarian revisionism and preventing the Habsburg restoration. France supported this alliance by signing treaties with each of the countries. Alliance started to break apart in 1936, with the complete disband in 1938. France saw in the Little Entente the potential to revitalize the threat of a two-front war against Germany in the interests of French security.

(4) Balkan Entente was loose alliance formed in 1934 by Yugoslavia, Romania, Greece, and Turkey to safeguard their territorial integrity against Bulgarian revisionism. It thus was in harmony with the Little Entente. The events of World War II caused the dissolution of the Balkan Entente.

(5) The Battle of Kosovo Polje was fought on St. Vitus' Day of 1389 between Serbs and the Ottoman Empire.
The Ruling Prince of Serbia, Lazar Hrebeljanovic, raised an army amounting to about equal of the total Ottoman force, not just a Serb army but a real Balkan coalition. He received help from his neighboring countries, most notably from Bosnia, Hungary, Albania, and even had a contingent of mercenaries made up mostly of Saxons. Sultan Murad I also gathered a coalition of soldiers and volunteers from neighboring countries in Anatolia and Rumelia, including the forces of Serbian prince M. Kraljevic to face the crusade.
Lazar’s army marched out to meet the Ottomans at the Kosovo Polje. The battle started with Serbian noble and Lazar's sons-in-law General V. Brankovic on one wing, Lazar in the center, and Captain Milos Obilic and Lord I. Kosancic commanding the third wing of the Christian army.
Opposite the Christians, Sultan Murad I led his Ottoman army of about the same size as the Serbian army. The two armies clashed and the Ottomans immediately gained the upper hand, especially because of the wing commanded by Beyazid I. But, as the day progressed, it seemed the Christians were gaining a tactical advantage. The two wings pushed forward and each side made their way into the Ottoman camp. But, the center army was being stopped. This army was being beaten so badly that Lazar was caught in the melee and killed in battle. T. Kotromanic, who had made a previous deal with the Turks, betrayed the Serbs at this point and retreated. The other two armies fought on. Eventually the two sides had beaten each other into the ground.
During the battle M. Obilic went into the tent of Sultan Murad I, posing as a traitor and offering his knights and his loyalty. As he pledged allegiance, he stood up and slashed the Sultan's stomach open with a dagger. Murad died and Obilic gave his head for his country, Serbia. This marked the Ottoman army's probable victory.
The new sultan, Beyazid I, reconciled with the Serbs by marrying princess Olivera, daughter of Prince Lazar. From then on, Serbs and Ottomans were allies. These policies eventually resulted in the Ottomans annexing Serbia in 1459.