This flag is fictitious, proposed, or locally used unofficially. It has not been adopted in an official capacity, and although it may be named as if it was 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, it does not have any official recognition. A flag of this type should not be added to any articles or pages unless it is officially proposed by a government agency, covered by the media, or sees notable local use.
The factual accuracy of this flag is disputed. The sources are likely unreliable, the first is a blog containing several Turkic flags, several of them fictitious and unsourced. The second is an image on Flickr claiming to be the flag of the Ottoman Empire in 1517, lacking any source. The third is about the history of Hungary, also containing the flags of Hungary, this flag is used in the section about Ottoman rule, but lacks any source or caption about it. The fourth is a Facebook post about Ottoman flags since Osman I, it seems that its source is the blog previously mentioned. The fifth is a page about the flags of Cyprus, it is lacking any source.
Summary
DescriptionFlag of Ottoman Empire (1517-1793).png
English: Ottoman Empire flag used during the reign of Selim I after the Mamluk war (1517-1793)
Nederlands: Vlag van het Ottomaanse Rijk gebruikt tijdens het bewind van Selim I na de Mamluk-oorlog (1517-1793)
Türkçe: Memlûk savaşından sonra I. Selim döneminde (1517-1793) kullanılan Osmanlı İmparatorluğu bayrağı
This image shows a flag, a coat of arms, a seal or some other official insignia. The use of such symbols is restricted in many countries. These restrictions are independent of the copyright status.
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Uploaded a work by Flag of Ottoman Empire (1517-1793) from https://turkicflags.wordpress.com/historical-flags-of-the-turkic-states/ https://www.flickr.com/photos/ateshahmedovic/3109940303 https://www.worldstatesmen.org/Hungary.htm https://www.facebook.com/212424193545148/photos/a.212429313544636/402195657901333/?type=3 http://www.vexilla-mundi.com/cyprus_history.html with UploadWizard