This stereoscopic viewer was offered to the Smithsonian as an Apollo-era astronaut training device. It contains the hand written name "E. A. King," the first Lunar Sample Curator appointed at the NASA Manned Spaceflight Center in Houston, Texas. The images are of terrestrial sites and were presumably used to familiarize the viewer with three dimensional appearance of geological features when viewed from altitude. No specific information of the particular use of this object is available. It was transferred from NASA to the Smithsonian in June 1969.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.