The Life Cycle of a Dying Die

A cud is a raised, blank area on a coin caused by a piece of the die breaking away at or near the rim. It's the final stage in a die's battle with metal fatigue — and every cud tells the story of a die that literally fell apart under pressure.

The progression is predictable and collectible:

Die cracks form — Hairline fractures develop from constant striking pressure (35-150 tons per strike)
Cracks extend to the rim — The fractures propagate outward
Die fragment separates — A section breaks away completely
Cud appears on coins — The unstruck area where the die piece was missing

Collectors who find coins from different stages of the same die's failure — crack, pre-cud, full cud — can reconstruct the die's entire lifespan. That's numismatic forensics.

What Makes a Cud Valuable?

Size matters — A cud covering 10-20% of the surface is a major cud worth significant premiums. Small rim blebs are common and modestly valued.
Location — Cuds that obliterate the date, mint mark, or a portrait feature are more desirable.
Die state progression — Finding examples from the same die at different stages tells the story of failure.

Cuds Are Accessible

Unlike many error types, cuds are among the most affordable die errors. Common-date cuds on Lincoln cents, Jefferson nickels, and Roosevelt dimes can be found for modest prices while still being genuine die errors with real collector interest.

Discussion

What's the biggest cud you've found or own?
Do you collect die state progressions showing the crack-to-cud journey?
Have you ever found a cud while searching rolls?
Which denomination produces the most interesting cuds in your experience?

Die Damage & Breaks

Cuds: When Dies Break at the Rim