Sign up for the monthly zoom events by sending a PM with your email address to Hitesh
Started by ZYV, September 02, 2014, 08:06:14 PM
0 Members and 1 Guest are viewing this topic.
Quote from: Figleaf on September 03, 2014, 11:59:29 AMSuch bi-metallic coins are usually made by feeding a pill and ring into the press. They are put together and struck in a collar. Because of the pressure of the strike and the collar, the metal of the pill and the ring are pressed together. To help that process, the pill and ring have matching blips and cavities.