mvojnovic's comment is basically correct, but since 'issued for use in Slovenia' is liable to be misconstrued, I will clarify the point.
The Kingdom of Serbs Croats and Slovenes (SHS) was set up as part of the dismemberment of the Austro-Hungarian empire at the end of 1918, and endorsed by the Treaty of Triannon in 1919.
Serbia had previously issued it's own stamps, and having reoccupied the country after prolonged Austrian occupation, had printed a whole new issue barely a month beforehand, and so were in no hurry to ditch the lot - whether for political/nationalist or economic reasons. But in the interests of fairness Croatia, Bosnia and Slovenia were allowed to produce stamp issues as well. Montenegro and Macedonia did not, being essentially regarded as part of Greater Serbia.
However (and I'm getting to the point at last!) all these stamps were valid for use in any other area of the SHS. And not just in theory. The Slovenian issues were by far the widest-spread. A quick glance at an album I have to hand shows the Slovenian issue cancelled at Osijec, Metkovic, Plozice, S.Samac, Zagreb, Varazdin, Sinj, Katuni and Plaski (all in Croatia) Brsko, Sombor, Prijedor and Sarajevo (Bosnia) and Gajdobra, Irig and Ruma (Serbia). I also have a postcard with a mixed cancellation of Slovenian and Bosnian issues cancelled in Doboj which is in Bosnia.
Other combinations, especially Serbian issues used outside Serbia, and Croatia/Bosnia used in Greater Serbia, are scarcer, and well worth looking out for.
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