Amulet from the Book of Raziel

Photo of this Star of David amulet is copied from the Jewish Encyclopedia entry Amulet written by Ludwig Blau.
Source: The 11th century book "Raziel" ... The four words outside of the circle are the names of the four rivers of paradise. In the circle are the names of Adam and Eve;
לילות
אנא בכוח
קרע שטן
קוף
a mystical name of God.