The listing, Lincoln Cent Lot of 20 Errors-Die Clashes!! has ended.
It takes looking through hundreds of rolls of coins to put together a set of 20 of these. You will not find anything like this here on Listia. Die clashes occur when an element of the coin is transferred from one side of the coin to the opposite side. In this case all 20 of these show some of Lincolns bust from the obverse transferred to the reverse in between the columns of the memorial. Each has been identified as to which bays of the memorial these show in. Saves you a lot of looking around. Best seen with a 5X magnifier. Mailed correctly and shipped free.