From what I've been able to discern, I believe this is a fairly early stereo view, c. 1860-80s or so, printed with Liberia Spithover, Roma, 85 Piazza di Spagna on reverse. Based on a few others I found online, I believe it is somewhat likely the photograph was taken by James Anderson, a British-born painter, sculptor and photographer who moved to Rome in 1838, was a member of the famous Caffé Greco circle' of early artists and photographers there, and  became well- known for his views of both Rome and classical sculpture. His early commercial prints often bear the blindstamp of the editor, Joseph Spithover.

In any event, though it shows some spotting and a couple of dark marks, I find it quite a beautiful thing, capturing Venus in all of her grace, and from a view that emphasizes her classic "Venus Pudica" pose, covering breasts and pudenda in a manner that emphasizes them all the more.

6 7/8" x 3 7/16". Spotting and surface marks as pictured and a little wear to the corners, but no warping to the board or other issues, and I rather like the effect of these surface imperfections subtly undermining the perfection of beauty herself.