1900s Keystone View Co Eye Comfort Depth Perception Series 3 Stereoscopic Cards For Sale



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1900s Keystone View Co Eye Comfort Depth Perception Series 3 Stereoscopic Cards:
$125.0

1900s Keystone View Co Eye Comfort Depth Perception Series 3 Stereoscopic Cards Front of card:BO1Keystone View CompanySKSStudios and FactoryMeadville, Penna.Made in U.S.A.Copyright Underwood & Underwood, Inc. Back of card:The Keystone Eye Comfort and Depth-perception SeriesFor the development of Comfortable Vision and a high degree of depth perceptionE.C.2-V32930 Changing Fixation from 8 to 3 requires 7 1/2 prism diopters of positive-convergenceCopyright Keystone View Company Meadville, Penna. Printed in the U.S.A. Cards are curved, not flat


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