Antoin Sevruguin's studio stamp on verso.
This image appears in the Antoin Sevruguin section of the book "The History of Photography and Pioneer Photographers in Iran." by Yahya Zoka. Published in Tehran in 1997. The description states that this is a crowd gathering during the Mashrūtiyyat,or Constitutional Revoloution in Iran, which took place between 1905 and 1911.