It is from the Louvre Museum and is dated 1860 on the back of the card. The image shows the Antinous-Aristaeus statue.
Stereoviews are designed to be seen through a stereoscope, which she does not have but is tempted to purchase.
When looking through the scope it produces "3-D" version of the image.
It is amazing to think how many hands held this image and were able to see the glory of Antinous.