c. 1915-18 antique american no. 535 green enameled drop light bowl-shaped x-ray "mercury glass" reflector with oversized fitter opening

seldom found and highly desirable early 20th century antique american interior green enameled industrial "mercury glass" deep bowl drop shade designed and fabricated by the national x-ray reflector company, chicago, il. the no. 535 shade or reflector remains in great shape with the original green enameled finish intact. the ribbed glass shade contains an unusually large shade opening for use with a 3 1/4 inch fitter. the shade is free from cracks and breaks. only one available. measures 8 x 8 inches.