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ISKRA
very interesting array of Southern Slavic coins, I may be wrong and you would know this, but wasn't former Yugoslavia both pre WW2 and after it, delineated by those who were Orthodox Christians - Serbs, Montenegrins, Macedonians using the Cyrillic alphabet and Slovenes, Croats as Catholics and Bosnians (Muslim and mixed) using the Latin alphabet? Whereas, Serbo-Croat as a language used both alphabets and was mutually intelligible between the various groups? Then Tito appeared, suppressed nationalism and defied the Soviets, later at the end of c20th the country fell into a mutually brutal civil-war but I think your part Slovenia seceded without bloodshed?
I think coins having a monarch's bust facing different directions is a tradition in most monarchies when the monarch changes.