Clever, Insider-ish Homemade Stereoview with Kilburn Brothers Stereoscopic View Factory Sign No

Finding this one made me happy--very clever! People who know about the history of stereoviews know that the Kilburn Brothers (Benjamin and Edward) of Littleton, New Hampshire were notable photographers and early, leading producers of stereoviews, beginning in 1865. So this vintage homemade stereoview capturing a view of the historical marker outside their Littleton factory is a very knowing sort of homage. C. 1960s-70s I believe. 

7 x 3 5/8" Good condition, mounted to heavyweight card, with some surface wear to the card around the corners.