What is a Radical MAD Die Clash?

A Radical MAD Die Clash (RMC) is a coin variety in the "Die Clash Family" group. It results from an anomaly during die clashing at the United States Mint. Coins exhibiting this error carry distinct diagnostic markers that distinguish them from normal strikes and are actively collected by error and variety specialists.

How does a Radical MAD Die Clash occur?

A Radical MAD Die Clash occurs due to the obverse and reverse dies striking each other without a planchet between them, transferring design elements from one die onto the other. Once the affected die enters a production run, every coin it strikes carries the same diagnostic markers until the die is retired or replaced.

How do I identify a Radical MAD Die Clash?

Look for faint, incuse outlines of the opposite die's design elements in the fields of the coin. Common clash marks include partial lettering or profile outlines appearing where they do not belong. For confirmed Radical MAD Die Clash varieties, cross-reference the coin against the NumisDex catalog entry which lists known die markers and attribution details.

Are Radical MAD Die Clash coins valuable?

Value depends on the specific die variety, the prominence of the error, the coin's grade, and collector demand. Some Radical MAD Die Clash varieties are common and modestly priced, while others — especially early die states or dramatic examples — can command significant premiums. Check recent auction records and price guides for the specific variety.

Where can I find Radical MAD Die Clash varieties in the NumisDex catalog?

You can browse all known Radical MAD Die Clash varieties on NumisDex by visiting the catalog and filtering by the "Radical MAD Die Clash" error type. Each listing includes attribution details, die markers, and images when available.

Radical MAD Die Clash (RMC)

A Radical MAD (Misaligned Die) Clash occurs when the obverse and reverse dies clash while severely misaligned from each other. Error-Ref and MadDieClashes.com use the same definition: the hammer die is both shifted a long way sideways and tilted, so that only the downward-tilted edge of the hammer die touches the anvil die. The resulting clash marks sit far from where a normal die clash would place them, and they cover only part of the die face. The "radical" designation distinguishes these from conventional horizontally misaligned clashes, where the hammer die is shifted but still meets the anvil die face to face.

How Does It Happen?

A radical MAD clash needs a hammer die that is out of position in two ways at once, with no planchet between the dies when they meet:

Horizontal misalignment: The hammer die is offset a long way to one side of the anvil die.
Vertical misalignment: The hammer die is also tilted, so one side of its face sits lower than the other.
Partial contact: Only the downward-tilted edge of the hammer die reaches the anvil die. The rest of the two die faces never touch.
Design transfer: Marks can be left on either die or on both. On the hammer die, what the anvil die usually leaves is a curved trace of its field's outer edge, with a few of the neighbouring letters.

Error-Ref and MadDieClashes.com doubt that these clashes happen during a normal press run. Their view is that the dies touch while being installed, perhaps when one is dropped onto the other.

The distinction between a conventional misaligned clash and a radical MAD clash is the tilt. In a conventional horizontal misaligned clash, the hammer die is shifted sideways and the whole clash pattern is shifted with it. In a radical MAD clash, the die is also tilted, so only one edge makes contact.

How to Identify a Radical MAD Die Clash

A curved edge mark: On the face struck by the hammer die, look for a curved line that is an impression of the edge of the opposing die's field, with a few letters from the opposing legend beside it.
Far from the expected position: The marks lie well away from where a normal clash would put them, because the dies were far out of line when they met.
Partial coverage: Only a portion of the opposing design transfers, because only one edge of the hammer die made contact. The rest of the face shows no clash marks.
Light marks: Error-Ref describes the clash marks as invariably light. Expect to need magnification and good light; a bold, deep clash is not what the sources describe.
Repetition: Like other clash marks, they are on the die, so every coin struck by that die after the clash shows them in the same place until they are polished off or worn away.

Notable Examples

Lincoln Cents, 1990-2000

Error-Ref and MadDieClashes.com both name Lincoln cents from 1991 to 2000 as the modern U.S. coins where radical MAD clashes are known. The MadDieClashes.com listing of U.S. radical MAD clashes is mostly Lincoln Memorial cents numbered by date, from MDC-1c-1990-01 through the 2000 entries.

Two-Cent Pieces and Indian Cents

Earlier examples are known too. MadDieClashes.com lists an 1864 two-cent piece (MDC-2c-1864-01), and both sources say some Indian cents show radical MAD clashes.

Foreign Coins

Both sources point to Spain and Canada. The MadDieClashes.com foreign listing includes Canadian cents from 1958 to 1963 and a 1949 five-cent piece, a 1965 Spanish peseta, and a 1963 Australian penny.

Collecting Tips

Learn the curved edge mark: The diagnostic is a light, curved impression of the opposing die's field edge with a few adjacent letters. A clash that shows a whole, bold design shifted across the coin is a different kind of misaligned clash.
Authentication: Light clash marks can be mistaken for die scratches or post-strike damage. Compare a suspected example with the photographs and overlays published for listed die pairs.
Measurement and position: Record where on the coin the curved mark lies, by clock position, so the coin can be matched to a listed die.
MadDieClashes.com: This is the reference for cataloged MAD clash varieties. It is edited by Jason Cuvelier and Mike Diamond, and its listings use MDC numbers with photographic documentation and overlays showing how the dies were positioned when they clashed.
Search the right dates: For U.S. coins, the listed examples are concentrated in Lincoln cents of the 1990s, so that is where to look first.
Die pair tracking: Like all die errors, radical MAD clashes affect every coin struck from the affected die after the clash event. Finding additional examples from the same die pair strengthens the attribution and documents the error's extent.

Radical MAD Die Clash