Old 1925 Medical Optical Stereoviews w/ Underwood Viewer for Squint Eyed People

Description

This is the most interesting set of stereoviews. Dated 1925, this was a set of 28 that advertised for the use of 'squint eyed people'. Booklet written in German and English. The views are fragile and a few have damage but for the most part are generally in very good shape. Missing 4 stereoviews. Awesome images in original envelope. The viewer is marked Underwood & Underwood, with a patent date of 1902, 1903, 1904. It is in very good condition with no missing pieces and just minor edge wear. An unusual twist to the normal stereoview cards. Good luck!
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