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This flag is fictitious, proposed or locally used unofficially but not adopted. It may be named as it would be as an official flag of a geographical or other entity and have some visual elements that are similar to official logos or flags of that entity, but it is not official and doesn't have any official recognition. Under any circumstances whatsoever, you should not add these flags in any articles, unless it is proposed by a government agency or it is covered by the media or if the flag is locally used.
Summary
DescriptionHissflagge Oberbayern.svg
Deutsch:
Bekannter Vorschlag einer horizontalen Flagge für Oberbayern
Die Verwendung von Weiß-Blau ist allerdings dem Land Bayern vorbehalten (Staatsflagge Bayerns).
Auch inoffiziell (lokal verwendung), aber in Verwendung, ist die Bannerform.