Vintage green glass insulator measures about 4-1/4 inches high and 3-1/8 inches bottom diameter. Front is marked Hemingray. Back is marked Patented Oct 8 1907. Smooth base. There are numerous chips on this threaded insulator. Straw marks and bubbles. Average condition. Glass insulators aren't just for the collector - they also work great as desk paperweights or as decorative window planters when hung upside down in a small macrame or shell hanger!