The number 240 in white appears on recto. The photograph is titled "Tagh-Bustam" on verso, in what may be the hand of Antoin Sevruguin.
Publications
Page 149 of "Sevruguin's Iran" published by Barjesteh van Waalwijk van Doorn & Co's Uitgeversmaatschappij in Rotterdam and Zaman Publishers in Tehran. The number "240" in white also appears on recto in the same location.
The image (not accredited to Antoin Sevruguin) also appears on page 212 of "Persia, Past and Present" by A. V. Williams Jackson (Professor of Indo-Iranian languages at Columbia University) and published by the Macmillian Company in New York in 1906. The photograph is titled: "The Vaulted Stone Grottos of the Tak-i Bostan".
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.Sm.31. On recto of the print, handwritten number (inked, probably by Antoin Sevruguin) reads, "154", "11" and "80".
Titled "Taq-i-Bustan, Sassanid rock sculptures on the south side of the Bisutun mountain" on a halftone print in a 1926 catalogue.