Flag of the w:en:Yarkand County (w:en:Chagatai Khanate).
WARNING: This image is highly speculative. The main source pointing to this design is the Catalan Atlas, which as a historical primary source cannot be considered a reliable reference. This image should not be added to articles about the Chagatai Khanate. If it is added anyway, then its speculative nature must be a clearly indicated. Note that fotw is based on user contributions like Wikipedia, and hence not authoritative either.
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Martin23230