So I got out today and went to an old park. Running through the park is a ditch that was dug in the late 1700s by the Spanish. I found this about 20 ft from the ditch. It looks like it was cut in half. It is exactly half the size of a dime. Did I find a piece of cut silver? Only detail I can see is in the center top portion of one side. It reads 20-21 on the Equinox...41 on the Legend and 39 on the CTX.