A good example, Ted, of what you are saying about numbers just happened to me yesterday morning. Moving across an area not to far from the car that has been hunted pretty hard by three of us of late, I got a nice mixed tone and lock on 20/21 tid on my Nox 600. Having dug numerous old wheats with those numbers and a couple of I H's and some wheats at 18 and 19, I dug it. As it turned out it wasn't either a wheat or I H. It was a well worn 1790 half reale. Un-fortunately, I've dug many other targets that are of the same numbers that are trash, but that reale had a nice soft tone and small feel like a coin to it. For me, the tones are pretty telling on the Nox and I have 81 years old hearing. HH jim tn