There is a handwritten number in white ink, probably in the hand of Antoin Sevruguin, that reads, "1". This same number in the same location appears on the glass negative of this image in the the Freer Gallery of Art and Arthur M. Sackler Gallery Archives and of the other gelatin silver print of this image in the Nelson collection.
A glass negative of this image is also in the Myron Bement Smith collection of Antoin Sevruguin photographs in the Freer Gallery of Art and Arthur M. Sackler Gallery Archives. Smithsonian Institution, Washington D.C. The glass negative was a gift of Katherine Dennis Smith, 1973-1985 and is referenced: FSA A.4 2.12.GN.30.04