A pristine condition Kopp Glass Cobalt Blue Traffic Signal Lens is the next item here for your consideration. No gaskets, box or any other installation items are included. Found this is an old barn, buried under wet papers & boxes, naturally padded & protected. Measuring: 4 3/4" diameter, clearly marked on inside edge “Kopp Glass”, there is no other marks. Smooth on front, textured on opposite side. This particular color Blue is amazing, love, love Blue! 2729-000 Vintage Kopp Signal Lens, Cobalt Blue Old Traffic Lens