Patent ID: 8533929

Claim:
A method for fabricating a coin assembly comprising: (a) step configured to perpendicularly punch inner and outer surfaces of an external ring and to anneal and acid-pickle the punched inner and outer surfaces; (b) step configured to perpendicularly punch inner and outer surfaces of an internal ring and to process a recess in the outer surface, and configured to process an edge in a circumference of at least one of front and rear surfaces of the insert and to anneal and to anneal and acid-pickle the edge; (c) step configured to punch and anneal an insert and to process a recess in an outer surface of the insert, and configured to process an edge in at least one circumference of front and rear surfaces of the insert and to acid-pickle the edge; and (d) step configured to couple the insert to the inner surface of the internal ring and to press-assemble the insert, the internal ring and the external ring with each other simultaneously to allow the inner surface of the internal ring inserted in the recess of the insert and the inner surface of the external ring inserted in the recess of the internal ring.