I'll try to post some time line with Serbian and Yugoslav roundels and markings.
Hope it's correct.
Please if you see anything wrong, fix me.
Thank you:)
Kingdom of Serbia, 1912-1915
Aircraft used in the Balkan Wars and early part of World War One displayed the Serbian national flag under the wings, or on the wingtips, and on the rudder or fin.
Main Marking and Fin Flash-
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Kingdom of Serbia, 1915
During 1915 several new aircraft were received from France, and it appears that a Serbian national marking was created by simply painting out the white of the original French markings with blue. This was done for both the roundels and the fin/rudder marking.
Combo-
Main Marking
Fin Flash
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Kingdom of Serbia, 1915-1918
After the complete occupation of the country by Austro-Hungary in 1915, Serb aircrew joined the French Air Force operating on the Macedonia front. By 1916, there were sufficient pilots to form several Serbian squadrons and these carried normal French markings with the addition of a Serbian flag on the fuselage side.
Main Marking
Fuselage
Fin Flash
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Kingdom of Serbs, Croats and Slovenes, 1918-1923 (1)
In 1918 the formation of the Kingdom of Serbs, Croats and Slovenes resulted in a profusion of national markings variants, including the use of the Serbian flag, the Russian flag and the new Kingdom of SHS flag. The marking was normally displayed on the wings and fuselage sides (or rudders) of aircraft.
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Kingdom of Serbs, Croats and Slovenes, 1918-1923 (2)
A variation on the use of a flag insignia was the use of a red-blue-white roundel, similar to that used by the Imperial Russian Air Service during WW1. The main marking was normally displayed in the standard six positions on aircraft.
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Kingdom of Serbs, Croats and Slovenes, 1918-1923 (3)
Another roundel style used the same colour order as on British aircraft - blue-white-red. The main marking was normally displayed in the standard six positions on aircraft.
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Kingdom of Serbs, Croats and Slovenes, 1918-1923 (4)
A further roundel variation used the colour order white-blue-red. The main marking was normally displayed in the standard six positions on aircraft.
MainMarking
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Kingdom of Serbs, Croats and Slovenes, 1918-1923 (5)
A few aircraft carried a different style of roundel, with a blue ring surrounding the central red disc. This is possibly another quick modification of the French roundel.
Main Marking
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Kingdom of Serbs, Croats and Slovenes, 1918-1923 (6)
The last markings variation in this period was the use of a chevron-style insignia in the national colours. This was carried on the wings and fuselage with the chevron pointing forwards. In some applications the ends of the chevron were at right-angles to the arms of the chevron, as shown for the Main Marking above, in some instances with the ends parallel to the direction of the point, as show with the Fuselage marking, and sometimes with the ends at right angles to the direction of the point - forming a triangle shape. The national flag was often carried on the fin or rudder.
Main Marking
Fuselage
Fin Flash
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Kingdom of Yugoslavia, 1923-1941
Because of the wide variations in national markings being used, in 1923 a new standard marking was introduced. This took the form of a roundel with a white cross on a red, white, blue roundel. The roundel was displayed above and below the wings, but not on the fuselage sides. The blue, white, red tricolor was retained as the fin or rudder flash.
At a later date, the blue in the markings appears to have been replaced by a significantly paler blue than that used in the national flag.
Main Marking
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1945-1992
After World War Two, the roundel used by Yugoslav Partisan aircraft serving with the RAF became the basis for a standardised marking. This featured a red star over a blue and white roundel. The fin marking was the national flag with a yellow outlined red star on a blue, white and red background. The main marking is normally displayed on the fuselage sides of helicopters, and in the standard six positions on aircraft. Aircraft do not carry service titles.
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Serbia and Montenegro, 1992-2006
In 1992 a new roundel was introduced, featuring the national colours of white, blue and red as horizontal bands. The new national flag without the red star was used as a fin flash. The main marking is normally displayed on the fuselage sides of helicopters, and in the standard six positions on aircraft. The national flag is carried as a fin flash. Aircraft do not carry service titles.
roundel-
FinFlash
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Serbia, 2006-temporary
In 2006 the Yugoslav order of colours - blue, white, red - was replaced by the colour order on the Serbian flag - red, blue, white. The roundel and fin flash were changed to the new colour order. The main marking is normally displayed on the fuselage sides of helicopters, and in the standard six positions on aircraft.
Roundel
Finflash
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2006 proposal-
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2006 Adopted-