In 2012 I was able to purchase a photograph of a légionnaire of the 1er Régiment Étranger taken in Sidi Bel Abbes in the studio of Charles KARSENTY.
Research indicated that the photograph had to be taken before 1900, since Charles KARSENTY was active in Sidi Bel Abbes from 1880 – 1900.
The adres of the studio, printed on the back, was 15, rue Chabrière Sidi Bel Abbes.
With his work Charles KARSENTY obtained following recognitions:
Médailles à l’Exposition des Sciences Paris (1882),
exposition Industrielle Marseille (1886),
médaille de bronze, Le Havre (1887) et
médaille d’argent, Paris (1889).
Other adresses of his studios were 21 rue Chabrière, et 22, rue Mogador. Maison mère à Oran. 
In 2022 , I was able to purchase following photograph of a well decorated officer of the French Foreign Legion made by the same studio. This was taken 21 rue Chabrière.
Attempts will be made to identify the officer.
Fremdenlegion, Foreign Legion, Vreemdelingenlegioen