Stereoscopes 'Raumbild' (various)

compilation of five German folding viewers, (1) 'CK-RAUMBILD-BETRACHTER', rare oxblood Bakelite stereoscope by Raumbild Dresden made in the GDR around 1955, original box, viewer in good condition, box torn, (2) folding metal viewer in nice condition, this kind of stereoscope was used for the stereo books published by the 'Raumbild-Verlag' in the 1940s, (3) small dark brown Bakelite viewer labelled ‘Raumbild-Verlag Otto Schönstein’, in mint condition, (4) unusual folding viewer with adjustable eye base, black painted brass, unlabelled, in used condition, (5) boxed viewer made of black painted tin, original box labelled 'Stereo-Bilder u. Apparate A. Weber Wittelsheim (Haut-Rhin)' in good used condition, the viewer comes together with the 25 images series 'Au vieil Armand'. (5)