French Stereoscopes (various)

three French stereoscopes: all with wooden body, adjustable eye base and focus for glass slides in various formats, (1) Unis France ‘Standard’ for 6x13 format with hinged mirror in very good condition, (2) stereo viewer Unis France for 6x13cm format with hinged mirror, the indicator-arrow for the adjustable eye base is broken, otherwise in very nice condition, (3) sought-after Gaumont viewer for 9x18 slides, the left ocularadjustable eye base does not work, otherwise a nice collectable piece in good condition. (3)