"Vaska", the first Przewalski's horse from the wild to have reached Europe and the only of such who could be used for riding; photo from Askania Nova. Caught in 1899, he travelled to Europe via Kobdo (Mongolia). In 1900 he reached Askania Nova, a year later he was given to the Russian tsar and placed in Tsarskoye Selo, and after a few years given back to baron F. E. Falz-Fein to Askania Nova.
Date circa 1904 or little later
Source my archive
Author G. I. Riberger
Source: https://commons.wikimedia.org/wiki/File:Equus_ferus_przewalskii_2.jpg

Przewalski's horse (Equus ferus przewalskii) or Dzungarian horse, is a rare and endangered subspecies of wild horse (Equus ferus) native to the steppes of central Asia. Common names for this equine include takhi, Asian wild horse and Mongolian wild horse.