Camera Heritage Museum - This is a Russian medium format stereo camera. Gomz Sputnik (Cnythnk) Made in USSR in 1955. It's a black Bakelite three-lens Reflex for 6x13cm stereo pairs on 120
My Soviet Stereo Camera - Sputnik + GoPro POV landscape photography - YouTube
6 Stereoscopic Cameras for Analogue 3D Photography · Lomography