1987 (P) Lincoln Memorial Cent - CU-1C-1987-07 Cud

Description

From a die study perspective, cuds provide irreplaceable data about the structural limits of coining dies under production conditions. Each cud documents the moment a die exceeded its material capacity — the fracture pattern, position, and extent of the break all encode information about the stress distribution within the die at the point of failure. Metallurgists studying die steel performance use cud frequency data to evaluate whether specific die compositions or heat treatments produce more durable dies, and the systematic cataloging of cuds by variety researchers feeds directly into this applied science. For the 1987 Philadelphia cent, the presence of at least thirteen cataloged cud varieties across the production year suggests that die consumption rates were high and that quality control tolerances allowed some broken dies to continue striking coins long enough for the resulting errors to enter circulation. The copper-plated zinc cent planchets used since 1982, weighing 2.5 grams at 19mm diameter, present a moderately demanding striking challenge, and the Lincoln Memorial reverse design with its intricate columned facade creates stress-concentrating features near the rim that may predispose dies to peripheral fracture.

Cross References

• CU-1C-1987-07

External References