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Vintage Keystone #50 Home Training Stereoscope w/Test Card - Stereo Viewer For Sale
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Vintage Keystone #50 Home Training Stereoscope w/Test Card - Stereo Viewer:
$34.50
For Sale: Keystone "No. 50 Home TrainingStereoscope" viewer with Test Card.
This unique stereoviewer was developed by Keystone View Co. as atherapeutic tool for home use. Different cards were produced to correspond withtests and exercises related to vision acuity, color and depth perception,peripheral vision, etc.
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