Offered is an Antique / Vintage ~ Large Signal Green Convex Nautical Lantern Lens. It is glass and maker unknown. It stands 5-3/8" tall overall X about 5" wide and weighs 1.165 lbs. It has 4 outer ridges and 3 outer ridges either side of the middle area. It has a two edge flakes, and one sharp fresnel outer ridge flake missing ( 2nd to last photo shows that one best). The edge flaws may not be seen when installed? If you have a busted out lens, this is better than nothing. Ask any questions, I don't know what it goes to? Perkins Marine Lantern? Ships packed well, 2 lbs, USPS priority mail and cost depends on your location. Thanks for looking!