Kinsman’s Slide, East Landaff. Kilburn Brothers.
An almost identical single image was printed by E. Kilburn and titled Kinsman’s Falls. More information on the Kilburn Brother and approximate dating of their stereoviews can be found at: Southall, Thomas W.. “The Kilburn Brothers Stereoscopic View Company.” (1977). https://digitalrepository.unm.edu/arth_etds/40
Kinsman’s Falls, 1870s 
Kinsman’s Falls 2019 
Kinsman’s Slide 2019