Sztereó dianézők

3 pcs. of stereo slide-viewers. The left one: Hungarian homemade slide-viewer from the mid 1950s, which was fabricated of a product of Lemezárugyár (metal plate factory). The middle: Stereoscope slide-viewer produced in Russia, the Soviet Union in the 1960s-1970s. The right one: Stereo slide-viewer made in the German Democratic Republic in the 1970s. It is a part of an educational children's toy, …