The picture shows a view of both sides of this Old Cold War Atoms For Peace Religious Medallion Pendant Charm. It is not dated but it is old. The metal it is made of is unknown. One side has an image of the Virgin Mary atop a huge mushroom cloud from an atomic or nuclear bomb blast coming from the Earth globe below. The other side has St. Michael atop Satan in a battle with him. He is holding a sword in one hand and a balance scale in the other for justice. This is a very interesting charm. It is marked on the two sides as follows:
ATOMS FOR PEACE O' MARY PAX ST. MICHAEL PROTECT US
The medallion measures about 7/8'' x 1-1/2''. It is in excellent condition with an aged patina as pictured.