These seem to have been taken by photographer Rudolf Franz Lehnert, for who I created a page a long time ago.
This is such a wonderful set, taken ca 1890/1910 I think by an unknown photographer. There are some simularities to Slavegirls in Chains.
These photos seem to belong together, the photographer is unknown, the models remain a mystery.
Photographed by Julian Mandel
Here are some more Haremgirls photographed by Albert Arthur Allen
Some real old photos from unknown photographer