Here is a pre-owned unlabeled Star Headlight & Lantern Co., railroad lantern red glass lens.  (The lens is identified by the design and glass thickness and seems a perfect match to a similar blue lens that was labeled on the rim.)   It stands about 2 1/2 inches tall and has a diameter of 2 3/4 inches.  It shows some dirt or dust and a chip on one of the rings near the bottom.   Please see the pictures and ask any questions.