Is this the coin you meant to post? I'm seeing a 1947, not 1955.
Coinfrog is correct, this is just damaged. Similar patterns can be created by (de)laminations, but that would just result in lost metal without expanding the coin's diameter and also wouldn't appear on both sides like this. The displaced metal beyond the coin's normal size means that the metal was squeezed out after it was struck.
Coinfrog is correct, this is just damaged. Similar patterns can be created by (de)laminations, but that would just result in lost metal without expanding the coin's diameter and also wouldn't appear on both sides like this. The displaced metal beyond the coin's normal size means that the metal was squeezed out after it was struck.