Ive's Kromskop by Frederic Eugène Ives, Usa. (Photochromoscope) This viewer gives colour stereo viewing using the trichromatic process. 3 identical B&W stereo glass plates are placed on the 3 colour filters - red green and blue. A colour image in 3D is seen through the viewing lenses. The 3 plates are connected with fabric bands.
This is the stereo version. A mono version also exists.
Kromskop Frederic Eugène Ives, Photochromoscope