Found this at a Park 30 minutes north of me in Auburn, IN. I was using an Equinox 600 in Park 1, sensitivity was 21. This was about 6 inches down. The park is has been around since 1909 and used to back up the original Auburn/Cord Automobile factory. As I took a second scoop of dirt out of the hole with my hand and it fell on the ground in front of me along with a 1899 IHP. The IHP was toast though and looked like it was ran through one of this machines to make a penny into an oval.