Flag of the Kingdom of Hejaz from 1920 to 1926 and flag of Hejaz as part of the Kingdom of Hejaz and Nejd from 1926 to 1932. This flag was also used by the Sharifian Caliphate from 1924-1925, before Hejaz merged with Nejd to form a union (1338 to 1350 AH).
self-made, based on en:Image:Arab_Revolt_flag.svg
Orange Tuesday at English Wikipedia
(Original text: Orange Tuesday (talk))