Color Slide Handheld Viewer

This item is a vintage Argus PreViewer for color slides, model 660, in its original box. 
Manufacturer: Argus Cameras, Ann Arbor, Michigan, a division of Sylvania Electric Products, Inc. 
Function: A backlit, handheld magnifier used to preview individual photographic color slides. 
Power Source: Requires two "C" batteries (not included). 
Condition: The box indicates the model number as 660