Error Coins Worth Money: Doubled Dies, Off-Center Strikes and More

Mints strike coins by the billions, and occasionally something goes wrong: a die doubled during manufacture, a blank fed in crooked, a punch that clipped the metal. Collectors prize these mistakes, and the most dramatic ones can sell for hundreds or even thousands of dollars, sometimes straight out of pocket change.

Doubled dies: the classic error

A doubled die happens when the die itself receives a doubled image during manufacture, so every coin it strikes shows the same doubling. Look for clear separation or notching in the letters and date; on the famous 1955 doubled die Lincoln cent, the doubling in LIBERTY and the date is visible to the naked eye. Other well-known examples include the 1969-S and 1972 doubled die cents and the 1995 doubled die cent. True doubled dies can be quite valuable; flat, shelf-like machine doubling, by contrast, is common and adds essentially nothing.

Off-center strikes and broadstrikes

When a blank is not seated properly in the press, the design lands off-center, leaving a crescent of blank metal. Value generally rises with how dramatic the misstrike is, and coins struck around 40-60% off-center while still showing a full date often bring the strongest prices. A broadstrike occurs when the retaining collar fails, so the coin spreads out wider and thinner than normal with no reeded edge; these are collectible too, usually at more modest premiums.

Planchet errors

• Clipped planchet: a curved or straight bite missing from the edge, created when the blanking punch overlapped a previously punched hole in the metal strip.
• Wrong planchet: a coin struck on a blank intended for another denomination or country, such as a cent design on a dime planchet. These can be dramatic and can sell for significant sums.
• Lamination errors: flaws in the metal cause layers to peel or crack, leaving rough patches.
• Missing clad layer: modern US clad coins occasionally lose an outer layer, exposing the copper core on one whole side.

Other errors worth knowing

Die cracks and cuds (raised blobs where a piece of the die broke away), rotated dies, brockages (a mirror-image strike from a stuck coin) and struck-through errors (grease or debris between die and blank) all have collector followings. Values vary widely with the coin, the drama of the error and demand, so hedge your expectations: many minor errors bring only a small premium, while spectacular ones can do very well at auction.

Error or damage? The crucial distinction

The single most common mistake is confusing post-mint damage with a mint error. Dents, gouges, dryer-coin rims, drilled holes, acid etching and vise-squeezed doubling all happened after the coin left the mint, and they reduce value rather than adding it. Genuine errors show characteristics of the striking process: metal flow, raised (not gouged) features, and details consistent with die and planchet behavior. If you find something odd, start by identifying exactly what the coin is: Numist can identify a coin from a photo in seconds and give you an informational value estimate and condition assessment, which is a useful first filter before you seek a specialist opinion on a suspected error.

How to hunt for errors

Check your change and search bank rolls under good light with a 5x-10x loupe, focusing on dates, lettering and rims where doubling and clips show first. Handle finds by the edge and never clean them, since original surfaces matter as much on error coins as on any other; see our guide on storing and handling coins. For a valuable-looking error, authentication by a third-party grading service is worth considering, because altered and faked errors circulate too.