1966 Lincoln Memorial Cent - CU-1C-1966-08 Cud

Description

Designated CU-1C-1966-08, this eighth documented cud variety for the 1966 Lincoln cent provides further evidence of the toll that sustained high-volume production took on the Philadelphia Mint's die inventory. When a business strike die produces coins, each impression subjects the die steel to compressive forces exceeding 40 tons concentrated over the small 19mm diameter of the cent. The rim area absorbs disproportionate stress because the die collar confines the metal flow during striking, creating a zone of intense pressure at the die's periphery where the cavity meets the collar wall. Over hundreds of thousands of strikes, this peripheral stress nucleates microscopic cracks that gradually propagate through the die steel. When a crack reaches critical length, the affected section of rim separates abruptly, producing the die failure that creates a cud on subsequently struck coins. Cross-referenced as CU-1C-1966-08 and attributed by Cuds on Coins. The 1966 date carries no mint mark under the Coinage Act of 1965, which had removed all mint marks from U.S. coinage beginning the previous year. Struck on a 3.11-gram, 19mm planchet of 95% copper and 5% zinc.

Cross References

• CU-1C-1966-08

External References