It's been suggested this might be a stereoscopic viewer for views about a 1/3 or so full format. Notman did produce child size views of his first 1859 series -- I had a few , now in Library and Arhives Canada.
OR is it a CDV viewer, like one patented in the USA in 1865 -- the American version has two flush lens, not tubes, but a similar shallow box,studded with half-circle bone decorations.[/] decorarations?
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