Rob, thank you for your input! Based on what I've read, the color of the card and its square corners would place the stereoview from the 1850s. Also, there were other photographic methods available in the 1840s that involved the use of negatives. One of the pioneers of that method was William Henry Fox Talbot. Edward Anthony was a pioneer of photography in America, and in 1847 he traveled to England and learned directly from Talbot how to make photographs from negatives. He later produced some of the earliest stereoviews available in the US. So it doesn't seem far-fetched that he would have tried out what he learned in England and taken a picture with his buddies, and then used the negative to make a stereoview a bit later.
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