NGC 1972-S proof Jefferson nickel with a cud as the base of Jefferson's bust. The cud, also known as a "major die break", occurred when a piece of the die adjoining the coin's rim broke and fell away...
NGC 1978 Jefferson nickel struck on a pre-strike damaged cent planchet. The coin is struck on the copper-alloy planchet of a Lincoln cent, and is both the weight and metal of a Lincoln cent. Nice...