These are "shooting or sight seeing spectacles from 1860. The clear area of the lens is heavily frosted forcing the user to look through the amber area.This is a rare form of this style spectacle. It was designed to allow more light to reach the eye when compared to similar spectacles that have a solid amber lens."
This pair of glasses is made from brass plated with silver. It has no makers mark and is most likely American made. The double lens frame was invented by Dr. Richardson, a London optician, in 1795. This pair most likely dates to between 1800 and 1810. How interesting - a website where you can buy vintage eyewear for everyday use.
They have all kinds. It's like a little museum of eyeglasses.
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