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Tin stereoscope viewer (De Jong)

Item is a compact green tin stereoscope viewer adorned with a gold leaf and painted floral design. Item is collapsible. Manufacture's brand is stamped between viewer lenses. Item comes with two silver gelatin stereoscopes from the Pocket Rotoscope a different manufacture of stereoscope viewers and stereographs. Images show portraits of celebrity women from the 20th century. Both women wear Victorian style costumes. Dutch text written on object suggests that item was a promotional stereoscope for a Chocolate and Cocoa company. This object was used to view two nearly identical photographs, or stereographs, as one three dimensional image. The stereograph would be placed in the sliding card holder and adjusted to fit the user's vision until the two images overlap to mimic a three-dimensional effect.