Neat old large indicator with ruby red rounded convex glass or glass like front. Fits 1" hole (see picts for dimensions) Great steampunk indicator! Has nice dark colored trim ring. Takes 2 pin bayonet bulb such as GE-68 Has bulb in it for sample, but bulb may be no good, so plan on finding a bulb (or LED) to fit it depending on your needs . See picts where we held the lens up to our camera flashlight so you can see how it may look with a bulb (bright bulb, or a dimmer one will have a more subdued shade of red)