given the small size (and i assume , thin?) and what appear to be a lot of squiggly lines on it, I would guess Ottoman silver 1500s-1700s-- even though new england is not a likely place to find these. But they did get around as jewelry pieces. However I also agree it could be a home-made silver piece. I don't see any letters or numbers on it that would pass it off as a U.S or European coin.