2021 (P) Lincoln Shield Cent - CU-1C-2021-05R Cud

Description

CU-1C-2021-05R is a reverse cud in the 2021 Philadelphia Mint Lincoln Shield Cent catalog and belongs to a cluster of die rim failures from this date. The "R" suffix in Cuds on Coins nomenclature designates the reverse die as the failure source, distinguishing it from obverse cuds that lack the suffix. This cataloging convention allows researchers to track whether obverse or reverse dies fail. A cud forms through a mechanical process: repeated striking generates cumulative fatigue in the die steel, hairline cracks develop at stress concentration points along the rim, and eventually a section fractures and separates. This reverse entry for 2021-P was cataloged by Cuds on Coins.

Cross References

• CU-1C-2021-05R

External References