Photo shows Lay seated at a table with shelves full of rolls of paper behind him. Date based on Lay's approximate age in photo.
Charles Downing Lay, ca. 1902 / unidentified photographer. Oliver Ingraham Lay, Charles Downing Lay, and Lay family papers, 1789-2000 bulk (ca. 1870s-1996). Archives of American Art, Smithsonian Institution.
U.S. public domain
Archives of American Art, Smithsonian Institution Washington, D.C. 20560