Extracted from the 1880 Priced and Illustrated Catalogue of Optical Instrument by James W. Queen & Co.:

3096. QUEEN'S STUDENT'S MICROSCOPE, MONOCULAR, 14 inches high, of highly finished brass; Stage of Glass, with perfectly smooth motions in all directions; Plane and Concave Mirrors; Revolving Diaphragm, which may be entirely removed when extremely oblique illumination is required; Draw-Tube; Rack and Pinion and Fine Screw adjustments for focus; with

Two Eye-pieces, Nos. 1 and 2;
2/3-inch Objective, 30 degrees angle of aperture;
1/4      do.        95   do.             do.       ;
Condesing Lens;
Upright Walnut Case with brass handle and lock and key,          $75.00