Zero Stock- Antique Naturalist Loupe Adjusting Magnifier

Excellent pocket explorer’s brass adjusting loupe or simple microscope made in mid 1800’s most likely in England. The device has two lenses and has a nice brass focusing system.  Dimensions closed 58 mm and opened 80 mm and 46 mm base. A small scratch present on the eye lenses and some spots of oxidation on the tube.