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:
$125.00
1900s Keystone View Co Eye Comfort Depth Perception Series 3 Stereoscopic CardsFront of card:BO1Keystone View CompanySKSStudios and FactoryMeadville, Penna.Made in U.S.A.Copyright Underwood & Underwood, Inc.
Back of card:The KeystoneEye Comfort and Depth-perception SeriesFor the development of ComfortableVision 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 KeystoneView Company Meadville, Penna. Printed in theU.S.A.
Cards are curved, not flat
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