I need to go back there and hunt more, but was running out of time yesterday. I left some marking tape on the tree I found this closest to so I can go right back to that area. It was maybe 1000 feet away from a 1940s era house that burned down many years ago and is now just a cellar and a chimney, but none of the debris around it was ever cleaned up in any way. All the bricks that fell down are still there, there is stuff from in the house everywhere. I found old metal toothpaste tubes, and parts of pots and pans and stuff. None of it was ever cleaned up. So who knows, maybe a resident of that house had some kind of collection or something and this was part of it.
This is some tough detecting , but I definitely want to go back. I just need to work through it and be patient. The AT Pro is helping, but it is tough to use Iron Audio since there is Sooooo much iron, so I've had to leave it off except to check a target.
There is also a colonial wall there, as this house had bordered on a colonial farm (guy owning the farm now bought up all the land, and wants me to detect it and see what is there), and I was hunting along the wall where I had found a horseshoe piece hoping maybe to find some tack pieces, so when this rang brass on the AT Pro I thought maybe that was what I had.