The number 102 in white appears on recto. The photograph is titled "Istaphan, Chehel Sotoun" in what may be the hand of Antoin Sevruguin.
Myron Bement Smith Collection: Antoin Sevruguin Photographs. Freer Gallery of Art and Arthur M. Sackler Gallery Archives. Smithsonian Institution, Washington D.C. Gift of Katherine Dennis Smith, 1973-1985. Museum number: FSA A.4 2.12.GN.35.04. Handwritten number (inked, probably by Antoin Sevruguin) reads, "899." Scratched handwritten number (inked, probably by Antoin Sevruguin) is not readable.