CU-1c-1982-12(LD) Rim Cud

Description

Documented as CU-1c-1982-12(LD), this rim cud on the Zinc Large Date subtype records a peripheral die fracture on the 2.5-gram copper-plated zinc planchet with the wider date numerals. Rim cuds occupy a specific niche within the cud taxonomy: their fracture geometry confines the displaced metal to the coin's outermost margin, where the die face transitions into the collar channel, rather than cutting inward through portrait details or legend lettering. The mechanical basis for this localization lies in the stress concentration at the die-collar interface, where geometric discontinuity creates a natural initiation site for fatigue cracks under the repetitive compressive loading of high-speed coining operations. On the zinc planchet, the softer core material beneath the copper plating flows into the peripheral die void with different rheological properties than the harder bronze alloy — a distinction that die failure researchers can study by comparing paired entries like this one against its bronze counterpart. The subtype-specific numbering system catalogs this entry independently from any sequential-number cud that might document the same die break under the broader CU-1C-1982-XX framework, providing a parallel organizational structure for subtype-focused analysis. Attribution by Cuds on Coins.

External References