This camera designed for copying small size, (approximately 6x4cm) documents. The shatter and film advance all mechanical. Camera does not have any electronics. Film size, I believe, 16mm non perforated. Camera used 2x1.5Volts batteries of odd size only as a light source. Batteries of this size was produces in USSR and was common. But I can not find them anywhere now. It is unknown to me where such cameras was used. Perhaps at customs to make copies of passports for people entering and living USSR. Or may be at archives. It is unlikely it was used by military or secret services because of the many limitations of the camera like comparatively big size (approximately. 10x15cm), small film capacity and it bulky to use and reload. Also the way camera built (pretty cheaply) it would not qualify for military/KGB use. But I can be wrong. More info needed on this camera.