I went up to my local school a couple of weeks ago to detect in the evening. Told my wife I would be gone for 1 hour. The school was constructed in 1959. I have found quite a few wheat cents and about a dozen silver coins. The oldest coin was a 1942 Merc. Went to an area that I hunted time and time again. I have an CTX3030, but I was using my Etrac, Old Faithful. I was running TTF with the 15" Coiltek WOT. Got a good conductive signal and pulled up a 1964 Rosie. Fifteen minutes later about 20 feet away I got a 9-45 signal about 6" deep. Dug the target and came up with this 1876 seated dime! Who would have thunk? The old timers here tell me that before the school was constructed that whole area was just woods. You never know!