A Die Chip (DIC) is a coin variety in the "Die Damage Family" group. It results from an anomaly during die wear or physical damage 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 Die Chip occur?

A Die Chip occurs due to physical damage, stress fractures, or progressive wear on the die surface during production runs. 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 Die Chip?

Examine the coin for raised lines, lumps, or missing design elements that correspond to damage on the die. These features appear in the same location on every coin struck by that die. For confirmed Die Chip varieties, cross-reference the coin against the NumisDex catalog entry which lists known die markers and attribution details.

Are Die Chip coins valuable?

Value depends on the specific die variety, the prominence of the error, the coin's grade, and collector demand. Some Die Chip 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 Die Chip varieties in the NumisDex catalog?

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

Die Chip (DIC)

A die chip is a small piece of the die face that has broken away, leaving a tiny raised bump or blob on struck coins. Error-Ref treats it as the smallest form of die break: a piece-out of less than 4 square millimeters with no direct connection to the rim. Die chips are very common on coins of all denominations and eras, and most go unnoticed by casual observers. Collectors focus on die chips that occur in visually interesting locations: between or inside letters, on facial features, in star points, or in other spots where the small raised bump creates a recognizable or amusing effect.

How Does It Happen?

Die chips form through the same mechanism as other die breaks, a brittle failure of the die steel, but on a much smaller scale:

Stress at design junctions: The junctions between design elements and the field create stress concentration points on the die face. The sharp transitions between raised and recessed areas of the die are particularly vulnerable to micro-fractures.
Micro-fracture development: A tiny section of die steel at one of these stress points develops a fracture that isolates a small fragment from the surrounding die face.
Fragment loss: The small fragment separates from the die and falls away (or is expelled during the next strike). The resulting void is a tiny pit in the die face.
Raised bump on coin: When a planchet is struck by the chipped die, metal flows into the tiny void, producing a small raised bump on the finished coin.

Die chips are especially common in specific areas of coin designs:

Narrow gaps between letters: Error-Ref notes that chips often form in narrow interstices of the design, such as the gaps between the letters of LIBERTY on the Lincoln cent; a chip between B and E produces the familiar "BIE" cents.
Inside closed letters: Letters like O, D, B, P, Q, and R have enclosed interior spaces. The die steel forming the interior of these letters is essentially a small island surrounded by deeper-cut areas, making it vulnerable to chipping.
Junction points: Where two design elements meet at an angle (such as the serifs of letters, the points of stars, or the corners of shield elements), stress concentrations promote chipping.
High-relief details: Fine details that are deeply cut into the die create thin sections of die steel that are more prone to fracture.

How to Identify a Die Chip

Die chips have specific identifying characteristics:

Small size: Error-Ref sets the limit at less than 4 square millimeters. Larger areas of die material loss are classified as die breaks, and any break touching the rim is a cud.
Raised profile: The chip appears as a raised bump on the coin's surface — not a depression. If the mark is incuse (below the surface), it is a contact mark or other post-strike damage, not a die chip.
Irregular shape: Die chips have random, irregular outlines. They do not form geometric shapes or follow design contours.
Consistent position: The same chip appears in the same location on every coin struck by that die after the chip occurred. Comparing two coins from the same die confirms the chip's die origin.
No design detail: The chip area is a blank blob of metal — it shows no design impression because the corresponding area of the die was missing when the coin was struck.

Common Die Chip Locations with Nicknames

Collectors have given nicknames to die chips that appear in visually amusing locations:

"Filled" letters: Die chips inside letters O, D, or other closed letters create the appearance of a filled-in letter (grease in the die can make a similar, temporary effect; see Strike Through)
"BIE": A chip between the B and E of LIBERTY on a Lincoln cent looks like an extra letter I
"Extra eye": A chip near the eye of a portrait creates the appearance of an additional eye
"Horned" varieties: A chip at the top of a portrait head creates a horn-like projection (distinct from spiked heads, which are die cracks)

Notable Examples

"Extra Leaf" Wisconsin Quarter (2004)

Certain 2004-D Wisconsin State Quarters show a raised mark on the left side of the corn stalk on the reverse that resembles an extra leaf, in "High Leaf" and "Low Leaf" versions. The cause is disputed. A Treasury Inspector General report, covered by Numismatic News in 2008, traced the High Leaf to one Denver press in November 2004, found no evidence it was intentional and ruled out clashed dies, while an NGC note suggests a worker altered the dies with a tool. Either way, the extra leaf is a raised mark from damage to the die rather than a chip in the strict sense, and it shows how a small die defect in the right location draws collector attention.

Roosevelt Dime Torch Die Chips

The torch on the Roosevelt dime reverse, with its fine flame and narrow gaps, is a common location for die chips.

Lincoln Cent Date Die Chips

Die chips that partially fill digits in the date are easy to spot. A chip inside the 0 of a date, for example, creates a distinctive "filled zero" that can be verified by comparing other coins from the same die.

Lincoln Cent "BIE" Die Chips

The best-known die chips in U.S. coinage are the Lincoln cent "BIE" pieces, where a chip in the narrow gap between the B and E of LIBERTY looks like an extra letter. Error-Ref also shows a 2007 cent with a fairly large chip in Lincoln's hair, with a short die crack running from one corner.

Jefferson Nickel Die Chips

The lettering of the Jefferson nickel, including MONTICELLO on the pre-2004 reverse, offers many closed letters and narrow gaps where chips form.

Collecting Tips

Location is everything: Collector interest in a die chip depends almost entirely on where it appears. A chip in an open field draws little attention; one that creates a visual effect, such as a "filled" letter, a "horn" or an apparent extra design element, is what collectors look for.
Common vs. notable: Most die chips are minor and common. Do not assume every die chip is significant.
Magnification essential: A 10x loupe is the minimum for identifying die chips. Many chips are small enough to require 20x-30x magnification for proper examination and confirmation.
Documentation: Notable die chips are cataloged in die variety references. Wexler's die variety files, CopperCoins.com (for cents), and various denomination-specific references include die chip listings.
Cherry-picking potential: Because die chips are small and require examination with magnification, they are frequently overlooked by dealers and in bulk lots. Patient collectors who examine coins carefully find unreported die chips regularly.
Grading impact: Third-party grading services do not typically lower a grade for die chips, as they are recognized as Mint-produced characteristics. Notable die chips in significant locations are sometimes attributed on the holder.

Die Chip