Set of Four High Power Microscope Lenses with Case, by Pritchard, English, 19th Century

Set of four high power microscope lenses with case, by Pritchard, English, 19th century. Four copper alloy lens mounts with extremely fine lenses: one with its end and interior painted black and a 1mm lens, one with its interior painted black and a 3mm lens, one with a shorter and more elaborate frame and a 2mm lens and one that is painted black on the top and back and has a 1mm lens. Contained in a dark red leather case with purple silk lining in lid and dark blue velvet onto base.