Image © Ken Potter 2011 / Coin Courtesy of Frank Danna / Shot at Michigan State Numismatic Society Spring Convention
Shown here is an 1980 Indent Strike that falls in the Striking Error-Variety Division.
It was struck through an Off Center cent that was uniface on the reverse.
Thus the unusual spread of the indented area.

September 26, 2011—The P.D.S. cataloging system used here to list minting varieties was originally compiled by Alan Herbert in 1971. PDS stands for the three main divisions of the minting process, “planchet,” “die” and “striking.” Two more divisions cover collectible modifications after the strike, as well as non-collectible alterations, counterfeits and damaged coins.

Numismaster Article with more information can be found HERE

Numismaster Article with more information can be found HERE

Numismaster Article with more information can be found HERE