Found this in a field that dates back to the revolutionary war. The french camped there in the winter before joining Washington's army. This site is a town green and has had probably 1000's of people walking the site. It looks very old to me. It's made of brass with a nice brown toning. The shank isn't like any that I've seen before. It looks kind of like a drawbridge shank (its the only way I can think to explain it) . I'll Have to get a pic taken. Don't know what the 85 means either. Boyscouts have camped there over the years also. I mean what other button has a number on it except a military button? Could it be a boyscout button? Military sounds better to me. lol