There are no markings on these lenses indication the maker.
Corning Railroad Signal Glass Lens Lot Red White Blue USA Bicentennial 5” 3 PC
4 1/8 x 2 3/4 Corning Blue Railroad Signal Glass Lens Smooth 1935 AAR Tested
Vintage Railroad Lantern Signal Lamp Glass Lenses Red Green 2 1/2” U.S.C. Co. Pi
Vintage Adlake Railroad 4 Way Switch Signal Lamp Light Glass Lenses Electrified
ADLAKE Non-Sweating Switch Signal RAILROAD Train Lamp Or Lantern - Glass Lenses
