Flag used during the Mahdist Revolt in Sudan from "a copy of a letter dated 11 September 1952 from the Sudan Government Civil Secretary's Office, Public Relations Branch to Dr Ottried Neubecker with a drawing of the Mahdists' flag hoisted over the party headquarters.  The standard version of the flag is a horizontal black-red-green tricolour  with a white crescent (pointing upward) and spear overall in the center. Another version had the crescent and spear in the black stripe at the fly. Mark Sensen, 06 Aug 1996" (source: crwflags.com).
Self-made vector version of Mahdist Revolt Flag.png from the English Wikipedia, source: crwflags.com
Original: Dn9ahx (talk)Vector: Mnmazur (talk)