The guarantee of the title is attested by the hallmark applied to each coin in accordance with the following procedures:
a) Either by affixing a metal guarantee hallmark manufactured and marketed by the Monnaie de Paris under the conditions set out in the article L. 121-3 of the Monetary and Financial Code;
b) Or by laser marking with a hallmark authorised by the competent administrative authority under conditions laid down by decree in the Conseil d’Etat.