Emergency Back Blip

Ok, its not a back Blip as such but it is back in time. I mentioned recently that my dad was a proffesional photographer and teacher there of, but it is not only my family that liked their photography - my better half's grandfather and great grandfather were engineers that seemed to have traveled a great deal. The great grandfather had invested in a 3D (Stereoscope-Vision) camera that took glass slide photographs. We never have seen the camera but we do have around 100 glass slides in amazing quality, pin-sharp 3D from around 70-100 years ago and the viewer (a real emergency Blip - a web cam for God's sake).

We have no proper idea of valuation on the viewer or collection or even age of it. Anyone feel like enlightening us, we'd appreciate it. There are many great scenes from many interesting looking places and would therefore never sell but it seems rather precious and we would hate to loose it. I would also like to try cataloging them but don't know how.