From the town of Bački Petrovac in the north Serbian province of Vojvodina. The envelope theme and postmark are "Flora". I'm not sure if it was a special event or a first-day postmark for another stamp. The stamp on the right is from a set of six bringing attention to the World Expo to be hosted by Belgrade in 2027. The stamps in the set all have a space exploration theme. And the pair of stamps on the left from 2019 promote online safety for children.
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