Stereo Optical Co. Inc. Stereo Test Book and Instruction Leaflet (Stereo Fly Test

Description Of Item: Brown cardboard box stamped SO-001 STEREO-FLY 100290 containing black folder with image of a housefly and the words STEREO TESTS/STEREO OPTICAL CO., INC 3539 N. KENTON AVE. CHICAGO, IL 60641 in silver on the front cover. Back cover advertises other company products. Folder opens to reveal three stereo vision tests: Graded series of four circles within squares test for adults, house fly test for adults or children (three dimensional 'Vectogram'), and animals test for young children. Together with a pair of black plastic stereo viewing spectacles. Also a printed instruction leaflet, A5 format, printed in black and white on four sides, folded.