A lot of the illegal stamps nowadays are printed by companies that also print authorized issues for other countries -- as I understand it Stamperija is the current big offender here. Often the quickest way to identify whether a new issue is authorized or not isn't to contact the postal authorities of that country, but to determine who produced the stamp (based on imprint notations, or simple design similarities -- Stamperija's stuff has its own "look", which IMO isn't particularly attractive but some topical collectors like the stuff.) If you see that a stamp producer printed a stamp bearing the name of a country that it isn't under contract to produce, that's an unauthorized issue for certain.
Sometimes you can tell just by the extreme topical nature of the stamp, but nowadays unfortunately that isn't the dead giveaway it once was.
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