Vintage Stereoscope Viewer Underwood & Underwood Camera? 3D, No Markings on order Viewer

This is an awesome vintage piece!! Can be used to view stereo cards. It was made to make stereo cards look order 3D. Patented 1901 by Underwood & Underwood I Believe? But there are no markings on viewer, made of wood and Tin. In great condition for it's age , minor wear and scuffs, lens are clear. The handle folds up to lay nearly flat. This makes a great display piece or photo prop for old timely photos. You will not be disappointed with this wonderful piece of history!
Comes with 3 Viewing Cards
Measurements:
Appox. 12" length
Viewer is appox. 5.5" wide