Wooden Stereo Viewers (various)

collection of six simple wooden viewers for various formats (1) viewer by Unis France for 45x107 glass slides in mint condition, rack and pinion focus, (2) viewer Capi for 6x13 slides, nicely crafted in good used condition, with adjustable focus and hinged mirror, ground glass missing, (3) Unis France stereoscope in used condition for 45x107 glass slides, adjustable focus, diffusion screen missing, (4) very nice stereoscope with interesting focussing device in good condition, the 45x107 glass slide is mounted in a sliding carrier which is moved by a metal lever (5,6) two unnamed viewers for 45x107 glass slides in good condition. (3)