Negretti & Zambra stereo viewer.
Exceptional Negretti & Zambra Trapezoidal stereo viewer. Cooke's Patent N° 590B, sold by N&Z.
Covered in red Morocco leather, with brass fittings and eyepieces, and ivory button. A knob brings a pair of internal close-up lenses into position to enlarge the image.
Very early viewer, London, circa 1855-60.
Some damage on the covering