Keystone Stereocards: Roman Forum Ruins + Sphinx

. c. 1880, Lot of 3 Stereo Cards Showing Ruins of the Roman Forum & The Sphinx, Published by the Keystone View Co., Meadville, PA, Very Fine.. These three stereo cards feature dual photographic images mounted on curved black cards, with red printed text on the back, identifying the images of the Sphinx and the head of a camel on one, and Ruins of the Roman Forum on the remainder. Measuring approx. 3.5” x 7,” the cards have very sharp images that were part of the “Keystone Eye Comfort and Depth-Perception Series”. (3 items).