SOM BERTHIOT STEREO? MICROSCOPE LENSES PROJECTION? COMES A SLIT LIGHT THROUGH

The lens while looking through they show only a small slit of light coming through. See last picture. The two identical lenses are 46mm in hight and has a 20mm diameter.

Elements are clean and bright, show no anomalies.

Lens shows some signs of prior use and is overall in good condition. Shows minor scuffs marks, minor scratches, no dings, no indentations, some nickel plating rub off. The elements are in very good condition. No cleaning marks, no scratches, no haze, no fungus, no separation.