Rare type hand stereoscope for stereoscopic views Holms AC: 9x18cm. Oliver Wendell Holmes in 1861 created, but not patented a portable viewer, streamlined and much more economical than had been available before. The stereoscope, dating from the 1850s, consisted of two prismatic lenses and a wooden stand to hold the stereo card. This model offered here is very well done, and has a unique system for adjustable distance from the eyes to focus, just slide the view forward or backward in the frame, the wood is in excellent condition, the stereo effect it is exceptional in these stereo pairs of 9 colored handwoven, there is a mark printed on wood, which says:" GC & co-DRGM" that is," Georg Carette aus Nuremberg" , Germany. Height: 8.5cm. lens diameter: 35mm. Please see all the pictures as they are part of the description.