c.1860, English, unsigned, covered in tooled leather, hinged top to front and rear, both with mirrors and both with mother-of-pearl knobs, rack and pinion focusing, with two internal pairs of supplementary lenses on pull-out section, mounted on black ebonised stand, height 49cm For a similer stereoscope by Negretti & Zambra see: https://www.christies.com/lotfinder/lot/magic-stereoscope-no-202-1772862-details.aspx?from=searchresults&intObjectID=1772862&sid=dde69d7f-99e1-4e0a-8b97-584158a7c28e