Advertsient Stereoscopes (various)

exceptional selection of three German advertising viewers, (1) ‘Pendoplast’ Stuttgart , black painted metal body, adjustable focus, for stereoscopic transparencies on uncut roll film, with a very nice reel of promotion images for the German EKAHA Schnellhefter company from around 1930, (2) a later model of the ‘Pendoplast’ viewer labelled Beez-Patent from around 1950, black 'hammered' finish, ingenious transport mechanism, with a advertisement series on colour transparencies showing shoes, (3) simple collapsible viewer branded for the BIKA pharmaceutical company in Stuttgart, the left lens is cracked, otherwise in nice condition, comes together with three series of promotional images showing the production, herbal plants and models of the human body, every series with envelop and description in German. (3)