Very interested Dachau gorget! For sure its handmade in camp or in a few days after liberation (like a souvenir) Probably made for Polish person ( this is the image of the Black Madonna of Czestochowa but with crown as Queen and Protectress of Poland) The Holy place for the Poles See link :  https://en.wikipedia.org/wiki/Black_Madonna_of_Cz%C4%99stochowa Made in aluminium maybe from from some cans or bowls Rare item !