Pulled this from an old cabin site that is proving itself extremely interesting, more on it later. Ferrotype or tin type used metal for a backing on early photographs which explains why the center is rust. Took a while to find this variety described as rare, found one on another detecting site where it was incorrectly identified. Field 2. iron on, sens. maxed, recovery 6 super slow sweep in machine gun iron.
HH Jeff
HH Jeff