No makers name. For pictures approx. 16x10cm. Fold-down single lens, detachable panel with stereo lenses. Small stereo-graphoscope
Stereo-graphoscope; folding pattern with upper enclosed graphoscope for viewing paper transparencies, lower stereo viewer; lid missing. Hautecour stereo-graphoscope
Single and stereo lenses on separate, hinged panels. Ivory knobs from support rods and one picture clip missing. Circular plaque missing from stereo panel. Negretti and Zambra Stereo-graphoscope
