An iconic portrait of the Algerian freedom fighter Abd El-Kader [عبد القادر بن محي الدين] by Mayer & Pierson. Details like his hand and medal are beautifully enhanced.
The address on the back was the photographer's residence from 1855 on. Ernest Mayer was associated with Pierre Louis Pierson from 1855 until 1864.

Albumen print in good condition. Some original retouching spots visible.

Literature:
Boisjoly: 'Répertoire des photographes parisiens du XIXe siècle', 2009 (p. 202)