At various points in the process the metal should be annealed to prevent the metal from becoming too brittle due to cold working. When the coin should be annealed is somewhat subject and no exact rule exists. The hardness of the coin will depend on the type and the year it was minted. For example, silver half dollars minted up to 1964 are made with more silver and less copper than silver half dollars minted afterwards. | At various points in the process the metal should be annealed to prevent the metal from becoming too brittle due to cold working. When the coin should be annealed is somewhat subject and no exact rule exists. The hardness of the coin will depend on the type and the year it was minted. For example, silver half dollars minted up to 1964 are made with more silver and less copper than silver half dollars minted afterwards. |