pair of original and completely intact c. 1930's american industrial single-sided circular reflector signals likely fabricated by the libbey cataphote corp., toledo, oh. the "vitralux" by do-ray lamp co., and "king bee - foto ray" are generally similar in style and configuration. the plurality of closely spaced autocollimating sights or "reflector buttons" are spherical in shape, and are comprised of ruby red glass. the glass marbles are tightly fixed in a pressed steel enclosure with a backing containing a silver metallic finish. the flanking rounded edge perforated tabs (for mounting purposes) are completely intact. the reflective signals were likely used on truck trailers, railroad crossing signs, etc. each signal lens measures 5 1/2 inches in diameter (excluding the opposing tabs). priced for pair.