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Universal Photo Art Co Naperville ILL USA Stereoscope Viewer.
Has Pat'D April 20 Sep 28 1897 imprinted on it.
There's about 70 cards. Some front & back. Some are doubles.
The cards are interesting they have people, places & events. Even a few comic type cards. The place card are locations and sites all over the world. Some have dates of the late 1800s on it.
Stereoscope Viewer has a little rust around eye part but works great.
The Stereoscope is pretty cool but the cards are pretty awesome. The scenes and the history with them are invaluable.