The Vaquero found this yesterday in one of the yards I hunt. Another 1800s era home this time across the street from us. It was completed crusted when I dig it up initially thinking it was a cut of piece of copper pipe. Used my wife's mild jewelry cleaner on it and found this under the buildup. Vintage wise it's got to be fairly old since it was deep and near an old tree under some small roots. The Vaquero really works well in these tight areas and the 5.75 concentric coil has been very effective. The ring is stamped 18K but that could be plated or just a fake.