I found this what looks like a rock today, it's very heavy for its size. Also has a perfect circular hole directly in the middle. It was ringing up as a quarter/half dollar on my Garrett Ace 350. Found about 10 feet from old rock walls that were made over 200+ years ago. It's and empty field and looks like it could have been use for farming. And about another 10 feet away I found an old coin to worn to be able to make anything out, so I know the area is likely to produce some good stuff any ideas please let me know thank you!