File:Turkish - Dancing Kocek - Late 19th c - wiki.jpg

Summary
Dancing Köçek with a tambourine.

Photograph, late 19th c. Private collection.

From https://en.wikipedia.org/wiki/File:Turkish_-_Dancing_Kocek_-_Late_19th_c_-_wiki.jpg but uploaded locally to this wiki, because it is not yet in the Wikimedia Commons. It is believed to be in the public domain.