Stereocamera, developed by A.O. Gelgar, the author of the first SLR Sport, was made to use 35mm perforated film.
It would produce double frame 24x30mm. Guiliotine-type shutter had speeds of 1/25, 1/50, 1/100 and "B". Diafragm 6.3, 9, 18. Distance between lenses was 72mm, focusing form 1.5m to infinity. (photohistory.ru)
(Photo from Collection of VIktor Suglob)