Keys Stereo Viewer

United States, 1940s

Produced by Keys Stereo Products in California in the late ‘40s and early ‘50s. The same company also produced the Haneel Tri-Vision camera and at some point changed the company name to Haneel, patented the viewer and marketed it under the Haneel name. So you’ll more often find this viewer stamped with the Haneel logo and patent number. Supposedly, both the Keys and the Haneel brands had a larger battery-operated viewer and a smaller, non-illuminating viewer.

Primary Material: Plastic
Media Format: Slide mounted film chip
Light Source: Natural light (small version), battery-operated (large version)
Focus: Adjustable
Interocular: Fixed