I know it seems crazy, but my friend found a KG III half penny, 1799, in Wisconsin last year in a farm field. Him and his other buddy went back to the same field this week and found another British copper, likely another half-penny, a War of 1812 artillery button, and two Civil War eagle infantry buttons plus other stuff. Sorry I don't have any pictures to share for you, but it is amazing to me that this field has produced that early of items here in Wisconsin!