In 2005 I took The International Group for Historic Aircraft Recovery's aviation archaeology course at College Park Airport, Md., the oldest continuously-operating airport in the world and where the Wright brothers taught the U.S. Army to fly their first planes.
One of the items recovered has us stumped. Some think it's part of a military uniform or web gear, others think it belongs to an early 1900s car. It is a clip, or stud, of ferrous metal, possibly brass, about 1-inch long and high. The top part can turn to the side, as if to lock something, and the bottom T-shaped part has a hole at each end, perhaps to fasten it to something.
Go here for a picture: http://home.earthlink.net/~mffowler/cpartifact_clip.jpg . Any thoughts on what the heck it is would be appreciated!