CU-1C-2021-05R Cud

Description

Fifth reverse cud in the 2021 Philadelphia Mint Lincoln Shield Cent catalog, CU-1C-2021-05R belongs to a growing 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 more frequently — and for the 2021-P cent, the concentration of reverse cuds suggests that the Shield reverse die may experience particular stress along certain rim segments. 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. The gap between catalog numbers 03R and 05R indicates that entry 04R exists in the broader catalog but was processed in a different enrichment batch. Cataloged by Cuds on Coins, this fifth reverse entry for 2021-P establishes the date as one of the more productive in recent years for Shield Cent reverse cud discoveries.

Attribution History

• Discovered by Giselle Maldonado
• CU-1C-2021-05R
• Expert attribution by Cuds on Coins

External References