Eagle 12/8/8 with span wire attachment

The second signal I had acquired, and my first from Colorado. This was given to me from a man here in town some number of years ago. It's an Eagle model with 12/8/8 lamps. Pretty common for crosswalks in Longmont and still fairly common at regular intersections in Boulder City. I remember being told that the attachment on the top would allow this signal to be installed on a span wire.