This 7,92x57 appears to possibly have an IZZY headstamp. The round has been severely distorted by possibly some chemical. The powder inside shakes as if it were dry and as normal. Round is non magnetic. Brass looks as if it were wax that had been poured into a mold but pulled out before it completely dried. You can press your finger nail into the brass and leave marks. Casing has horizontal fracture. Could this be some IZZY battlefield pick up that was imported into the USA and acid washed, but left in the tank way to long??