German Stereoscopes (various)

three rare German stereoscopes for various formats and by different makers (1) beautiful ‘Heidoplast’ viewer in almost mint condition, for 45x107 glass slides, wooden body, adjustable focus and eye base (2) Voigtländer viewer in good, but used condition, for 6x13 slides and cards, wooden body, hinged mirror, adjustable focus and eye base, (3) Zeiss Ikon stereoscope for 6x13 slides and cards in nice original condition, wooden body, hinged mirror, adjustable focus and eye base. A nice and collectable selection of high quality viewers from the 1920's. (3)