22. Deficient Plating
Plating process is the last step before the strike. Electrodeposition is a chemical process which leaves a very thin layer on the surface of a blank. It only takes a small error when cleaning blanks and it will appear on the coin struck. In 1944-45 blanks without the chrome plating were punched by mistake. Since the new plating process, there are more and more coins with this defect.