PART V. Planchet Errors:
Bi-metallic Errors:
Struck Core
Definition: Bi-metallic error coins are restricted to foreign countries. These coins may experience any of the many types of striking errors listed in the Error-Variety Ready Reference however, one must understand we are dealing with two components, a ring & a core. Any number of exotic possibilities or combinations of die varieties, die errors, planchet errors & striking errors can be found on bi-metallic coinage.
A core enters the striking chamber without having been joined or mated with its ring.
The nature of this error allows a complete study as to the method of interlock joining the ring and core together.
