Part V: Planchet Errors:
Alloy Errors:
Intrinsic metallic inclusions
Definition: An intrinsic metallic inclusion includes all situations in which metal of a non-standard composition somehow resists melting or otherwise manages to maintain its integrity within the molten alloy.
This 1948 cent displays a large strip of light gray metal running across the obverse face. Close inspection reveals that the metal inclusion is an intrinsic part of the coin metal strip, present from the very beginning. It probably represents a globule of unmixed zinc or tin.
This is another intrinsic metallic inclusion that was found on the reverse of this 1944-P Lincoln cent.
Images are courtesy of Heritage Auctions.
