I puchased this one from a dealer specializing in stereoviews at the Photographic Historical Society of New England Photographica show last spring. It struck me formally, and for its unusualness, the images printed on paper rather than being photographs mounted to card--but I have not had much luck turning up other examples like it. Somewhere I found a note attributing it to the London Stereoscopic Company--but now I can't find that reference! What I do know is that the bridge, opened March 18, 1855 was the world's first working railway suspension bridge, spanning the Niagara River--a double-decked structure, with the top deck carrying trains and the bottom deck used for people and carriages, designed by John A. Roebling, who later designed the Brooklyn Bridge. And, connecting Niagara Falls, Ontario, to Niagara Falls, New York, it played a significant role in the Underground Railroad, allowing freedom seekers to cross into Canada. 

6" x 3 5/8". Good overall condition, with small tears coming down from the mounting holes along the bottom edge. With Appleton written in pencil on reverse; I've found a handful of photographs over the years with the Appleton name written on the backs of them--an important New England family tracing back to Samuel Appleton, who came from England to Massachusetts in 1635.