McManiacs Vintage and Antique Mall is selling antique stereoscopic cards!  The price is $5 for one, and 3 for $10.

What is a stereoscopic card?  Well, the stereoscope was the precursor to 3D.  The stereoscopic cards would be inserted into the stereoscope … with a slightly different images for the left and right eye.  When viewed, you would get the illusion of 3D.  The invention dates back to the early 19th century.

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