Taking the long way to Mt Cabot near Berlin New Hampshire, you can do a loop and cross over the bulge and the Horn. This route is worth it as The Horn is the only of the three that has views. And what views they are! Almost 360 degrees around from the summit boulder. The last little pitch is tricky but sooooo worth it!
The disc itself is brass, dated 1965, placed by the forest service and bears the name Horn on it. It is in the center of the top most boulder with nothing really to speak of to obstruct its location!