I have been amazed that my two oldest coins have come from "hunted out" public parks. These are parks where I regularly see other detectorists. There was even another person's plug a few feet away from when I dug this coin. And this is an area of the park I had been over many, many times over the years. This 1820 large cent is now the oldest coin I have found while metal detecting. It is in poor condition, but the date is clear. This is also surprisingly, the first large cent I have found.
I'm Nick A. and I am a metal detector hobbyist in Central Ohio. I have been metal detecting since 1990, and currently use the Minelab E-Trac detector.