Stereoscopic Korona, model VII of Gundlach Optical Co. Stereoscope 5x7"" . USA, 1905 Korona Stereo Camera Model VII was manufactured by Gundlach Optical Co. around 1905. Bellow in very good condition. The shutter is functional. No plates. Made mahogany grain leather seal, nickel metal work and red leather bellows. Features include a rack focus, a bright finder, a front wooden seesaw, and a display driven approach spring. Equipped with a pair of special glasses rectilinear symmetrical 4 x 5.