PART VI. Striking Errors:

Multiple strikes:

Flipover Double and Multi-Strikes

Definition: Most multi-strikes show the same face struck repeatedly. Coins that flip over between strikes are rarer.

The 1935 Lincoln cent shown below is an in-collar, flipover double strike.  After a normal first strike, the coin flipped over and landed back inside the collar.  It was then struck a second time.

The 2000 Lincoln cent shown below was first struck off-center.  It then  flipped over and was struck a second time
even farther off-center.  The second strike is uniface (struck against another planchet).