1: Victory over Fascism first anniversary (issued in 1946)
2: Youth Work Brigades (1) (1946)
3: S. Markovic (2) birth centenary (1946)
4-8: Slav congress in Belgrade (1946)
9,10: Centenary of the poem 'The Mountain Wreath' (3) (1947)
11,12: 1947 airmail stamps

1-3: Federal sports meeting (1947)
4: Balkan sport games in Ljubljana (1947)
5: Annexation of Istria and Slovene Coast (4) (1947)
6: Samac-Sarajevo railway construction fund (1947)
7,8: Centenary of translation of New Testament in Serbian language (1947)
9: Zagreb trade fair (1948)
10: 5th Communist Party Congress in Belgrade (1948)
11-13: Croatian Academy of Sciences and Arts (5) in Zagreb 80th Anniversary (1948)
14: L. Kosir (6) commemoration (1948)
15-17: Balkan and Central-European games in athletics (1948)
18: L. Kosir airmail stamp (1948)
19-25: Federative Peoples' Republic of Yugoslavia 5th anniversary (1948)
26: F. Preseren (7) death centenary (1949)
27,28: Ski Jumping in Planica (8) (1949)
29-31: Federative Republic of Macedonia 5th anniversary (1949)
32,33: Universal Postal Union (9) 75th anniversary (1949)

(1) Youth work actions were organized voluntary labor activities of young people in Yugoslavia. The actions were used to build public infrastructure such as roads, railways, and public buildings, as well as industrial infrastructure. The youth work actions were organized on local, republic and federal levels by the Young Communist League of Yugoslavia, and participants were organized into youth work brigades, generally named after their town or a local national hero. Important projects built by youth work brigades include the Samac-Sarajevo railway, parts of New Belgrade, and parts of the Highway of Brotherhood and Unity, which stretches from northern Slovenia to southern Macedonia.
Initial actions were organized during the Second World War in territories liberated by the partisans. After the war, actions were numerous and massive and the youth brigades made significant contributions to the rebuilding of their country, which was badly ravaged by war. In addition to cheap labor for the state, youth work actions provided a form of free holiday for teenagers.
As the country was rebuilt and its economy stabilized, youth work actions went out of fashion. However, they were revived in the late 1970s, in an effort to organize youth in political and cultural activities, as the work actions proved to play a large role in the socialization of those involved.

(2) Svetozar Markovic (1846–1875) was a political writer who was largely responsible for introducing socialism into Serbia and whom the Yugoslav Communists claim as their precursor.

(3) The Mountain Wreath (in original: Gorski vijenac) is a poem and play, commonly considered a literary masterpiece, written by Montenegrin Prince-Bishop and poet Petar II Petrovic-Njegos. Njegos published The Mountain Wreath, in 1847. It is a modern epic written in verse as a play, thus combining three of the major modes of literary expression.

(4) Former Italian territories in Istria, Dalmatia and Slovenian Coast became part of Yugoslavia by the Paris Peace Treaty signed in 1947.

(5) The institution was founded in Zagreb in 1867 as the Yugoslav Academy of Sciences and Arts. The bishop and benefactor Josip Juraj Strossmayer, a prominent advocate of higher education during the 19th century Croatian national romanticism, set up a trust fund for this purpose and in 1860 submitted a large donation to the then viceroy (ban) of Croatia for the cause. After some years of deliberations by the Croatian Parliament and the Emperor Franz Joseph, it was finally sanctioned by law in 1866. Strossmayer also initiated the building of the Academy Palace which was completed in 1880. The Academy published the scientific magazine Rad between 1867 and 1882, when each of the individual scientific classes of the Academy started printing their own magazines. A total of almost five hundred issues have been printed up to now as well as several other publications in history and ethnology. It was renamed " Croatian Academy of Sciences and Arts" in 1991 after Croatia gained independence from Yugoslavia.

(6) Lovrenc Kosir (1804—1879) is said to be the inventor of the postage stamp.
In 1835, five years before the introduction of the worldwide first stamps in Great Britain, he suggested the introduction of adhesive tax postmarks (aufklebbare Brieftaxstempel) to the Department of Commerce in Vienna, which was responsible for the postal system. These postmarks were to be used for the pre-payment of postage. He called them gepresste Papieroblate (pressed paper wafers), which are known today as stamps. Kosir conceived that the stamps would be modelled on the official sealing stamps that were already used in Austria. His suggestion was looked at in detail, but rejected for the time being.
Kosir was immortalised by Yugoslavia on several commemorative stamps. The country very much supported him being recognised as the one and only inventor of the postage stamp. On 21 August 1948, a commemorative stamp set was issued, which consisted of four stamps and showed his portrait. In the same year, the Yugoslavian postal system issued an airmail stamp depicting Lovrenc Kosir, his hometown of Ljubljana, and an aeroplane. What is special about these stamps is the allonge attached to each stamp. It has an inscription in Yugoslavian and in French giving information about his contribution regarding the invention of stamps.

(7) France Preseren, (1800–1849) was a Slovenian Romantic poet. Although he was not a particularly prolific author, he inspired virtually all Slovenian literature thereafter.
He is generally regarded as the national poet. In 1905, his monument was placed in the central square in Ljubljana, now called after him. By the early 1920s, all his surviving work had been catalogued and numerous critical editions of his works had been published. In 1944, the anniversary of his death, called Preseren Day, was declared as the Slovenian Cultural Holiday. In 1990, the seventh stanza of his Zdravljica was declared the national anthem of Slovenia. In 1992, his effigy was portrayed on the Slovenian 1000 tolar banknote, and since 2007 his image is on the two-euro coin minted in Slovenia. The highest Slovenian prize for artistic achievements is named after him. His poems have been translated into several languages.

(8) Planica is an alpine valley in northwestern Slovenia, not far from another well known ski resort, Kranjska Gora.
Planica is famous for ski jumping. The first ski jumping hill was constructed before 1930 at the slope of the Ponca mountain. In 1934 Stanko Bloudek constructed a larger hill, sometimes also called the mammoth hill. The first ski jump over 100 metres was achieved here in 1936 by the Austrian S. Bradl. This is the biggest jumping hill in the world, sometimes called "the mother of all jumping hills".
In March 1947 Bloudek and his coworkers managed to arrange a week of ski flights between Swiss and Slovene teams. A year later many more guests arrived. Beside Swiss and Slovene also French, Polish and Check. The hero of the event was Swiss Tschannen with a new record mark of 120 m. Nobody suspected then it was the last record for next 21 years.

(9) The Universal Postal Union (UPU) is an international organization that coordinates postal policies between member nations, and hence the world-wide postal system.
Prior to the establishment of the UPU, a country had to conclude a separate postal treaty with each other country that it wished to carry international mail to or from. The United States called for an international postal congress, which was held in 1863. This led H. von Stephan, Prussian Minister for Posts, to found the Universal Postal Union. It was created in 1874, under the name General Postal Union. In 1878 the name was changed to Universal Postal Union.
The UPU established that there should be a more or less uniform flat rate to mail a letter anywhere in the world, postal authorities should give equal treatment to foreign and domestic mail and that each country should retain all monies it collected for international postage.
One of the most important results of the UPU treaty was that it ceased to be necessary, as it often had been previously, to affix the stamps of any country through which one's letter or package would pass in transit; the UPU provides that stamps of member nations are accepted for the whole international route.