Die crack Coin Errors
What is a die crack error?
A die crack appears as a raised, irregular line across the coin's surface. It happens when the die itself develops a hairline fracture from repeated striking; metal flows into the crack on each strike, leaving a ridge on every coin produced. Minor die cracks are common and add little value; large or distinctive die cracks (especially through dates or central designs) are collectable.
How to spot one
- Raised, irregular line with rough texture — not a smooth scratch.
- Look for cracks running through dates, key letters or central design elements.
- Multiple parallel cracks indicate a heavily fatigued die ("die deterioration").
- A "cud" — a complete die break filling with metal — is the most extreme version (see Die cud).
Authentication
Easy to confuse with post-mint scratches. Genuine die cracks are raised; scratches are incuse. Run a fingernail — die crack catches on the way up the ridge.
Famous UK examples
Common; only major cracks through key elements carry premium.
Pre-2017 round £1 coins frequently show die fatigue.
Key-date UK coins worth examining
Errors on key-date coins compound rarity — the host coin is already scarce, and the error multiplies the value. Browse the rarest UK coins in our catalogue: