Thanks for the input. I think its silver and it came out of salt water. I didn't clean it and its not magnetic. Its about the size of a quarter and really stuck together tight. Feels heavy as well.
I see a silver coin with a reeded edge and now I know it's about the size of a quarter and it has a huge hole in the middle of it and it's sandwiched in with other material and one side is mushroomed out.
I have a couple of copper US 2 cent coins with a hole in the middle and you can clearly tell by the wear they were used as washers.