The pic of the slave women on the Fox News site is a stereoscope picture. Which means it was mass produced at some point in time.
You beat me by a few seconds. As a retired auctioneer, over 38 years in the budiness I sold quite a few stereopticons and the cards that were used in them
“The pic of the slave women on the Fox News site is a stereoscope picture. Which means it was mass produced at some point in time.”
The pic is stereoscopic, but it was not necessarily mass produced. Lots of homemade stereo views were made back then. Pictures of that period were made by the “wet plate” process, something available only to professionals or serious amateurs. It was not much harder with bellows cameras of the time to expose the plate with two lenses than it was to with one lens, so it is not unusual for private stereo pictures to be found today. I have several homemade stereo cards that are dated from 1867 and identify the location of the scene. All information on my cards is handwritten, not printed as the commercial cards usually are.