This stone mold was used to cast lead plates called signs, worn by pilgrims on their clothing as a souvenir of their journey. The face of St. Michaelis associated with the shell, evoking the fauna of the bay of Mont Saint-Michel. The saint's shield bears, on the face, a Virgin and Child, on the reverse, the arms of France. While most signs depict St. Michael triumphing over evil, this design is limited to the saint's face, a concentration of his protective powers.