Found this in a park today...the DFX was in the EPROM High Trash coin mode, indicated the depth was 4". Finally, after digging through 3 feet ( yes 3 feet! ), I finally hit the ring. I first thought it was a bucket, and was very excited with visions of a huge cache running through my head. After about 3 hours of careful digging, I pulled the ring out of the hole. Of course I put my DFX back in the hole and didnt get a thing. So, I was surprised that an iron ring showed up as a quarter target with a VDI of +90-ish. However, I was very impressed at the depth of my DFX. So please help identify this, like I said I'm pretty sure its some kind of barrel ring, you can see one of the nails in a pic (blue arrow) even though its a little blurry.