Tughra (i.e., seal or signature) of Abdülhamid II, Sultan of the Ottoman Empire (1876-1909). An explanation of the different elements composing the tughra can be found here.
The original PDF document from which this tughra was cropped is also hosted on Commons: File:Tughras.pdf
Egypt State Information Service: [1]
Calligrapher Sami Efendi [2]. (Vectorised by Fred the Oyster)