If it's lead, possibly a weight that fit inside the pendulum of some older scales 50-75lb range. Being lead, they are easily trimmed to calibrate the scale. Did it all the time while in the Postal Service.
Thank you! But I don't think it's lead. I've found really old lead before and it doesn't get any build up like that on it. There Is like a 1mm crust on it, and when I got finally got to the metal it didn't look like lead when I scratched it
Looks like a copper or brass washer. Mayeb more boat stuff. You can see an impression where it was tightened down. That type washer is called a fender washer. Tony
I cracked it in half and on the Inside it look like clay.. But when I dug into it the object looked metallic.. Really weird at work will post a picture when I get home