Stereo slide viewer middle frame. Thus, the images are mounted to the side by side in a frame of 50x50 mm slides. The special thing about this display is that the arrangement of the mirror is such that the result of the camera is placed in a frame without cutting the film and exchanging pictures and you can see with this stereo viewer good. Due to the configuration of the mirror, the slide is placed on the viewer in a way rather strange. This viewer was mainly used in the medical field to quickly see the result. The viewer probably part of accessories specialized equipment recording in the field, probably eye photography. The handle of the viewer is also a holder for Mono D cells and also contains the switch for lighting. A small bulb between the eyes near the nose shines through the slide, through 2 mirrors eye. a brand name missing. The display is made of cast aluminum, both front and rear. Support slide is stainless steel. The weight is approx. 600 g.