A Split Die (SPD) 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 Split Die occur?

A Split Die 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 Split Die?

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 Split Die varieties, cross-reference the coin against the NumisDex catalog entry which lists known die markers and attribution details.

Are Split Die coins valuable?

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

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

Split Die (SPD)

A split die is a die that has cracked so deeply that it has spread apart. It begins as a crack running from one point on the rim to another across the die face — the kind of crack that, when it arcs across an edge section, Error-Ref calls a pre-cud. In a split die, that crack has gone on down into the body of the die, through the neck and into the shank, and the two sides have pulled away from each other. On the coin, the split shows as a wide, raised ridge where metal has filled the gap.

Error-Ref draws the line between a die crack and a split die by width: a rim-to-rim crack more than half a millimetre wide is a split die. The width is not arbitrary. The deeper the crack penetrates into the die, the further the two sides can spread, so a wide split is a deep one.

How Does It Happen?

Dies fail by fatigue, and a crack that runs rim to rim has cut across the whole striking face. Most such cracks stay shallow: the die face is cracked, but the die beneath it is whole, and the crack shows on coins as a fine raised line. When the crack keeps growing downward, through the neck of the die and into the shank that holds it in the press, the die is no longer one piece of steel held together at the face. Each strike pushes the two sides apart a little, the gap widens, and coin metal fills it.

Most splits run across the middle of the die and divide its face into two roughly equal parts. Error-Ref calls these median, bisecting or symmetrical split dies. A split that runs off to one side, cutting off a smaller section, is an asymmetrical split die. The path can be straight, curved or irregular.

Split dies often occur together with capped die strikes. Error-Ref's explanation is that coin metal wedges itself into the split and makes the struck coin stick to the die face, where it stays to cap the die.

How to Identify a Split Die

A wide, raised ridge across the coin. It runs from rim to rim, like a die crack, but is much broader — over half a millimetre — and often irregular in outline where metal has filled an uneven gap.
Sideways spread only. The two sides of a split die have moved apart, but not up or down, and not along the split. Design on either side of the ridge sits at its normal height and in its normal position, simply further apart than it should be.
It repeats, and it widens. Every coin from the die shows the split in the same place, and coins from later in the die's life show it wider.

Split Die or Retained Cud?

An asymmetrical split die cuts off a section at the edge of the die, which is the shape of a retained cud, so the two can be confused. The difference is how the cut-off section has moved:

	Rim-to-rim die crack	Split die	Retained cud
Crack width	Under 0.5 mm	Over 0.5 mm	Any
The section	Part of the die	Part of the die, spread apart	Broken free, held in place
Movement	None	Sideways spread only	Up or down (a raised plateau on the coin) and/or along the break (design out of register)

If the design inside the section is raised as a block, or offset along the line of the break, the section is loose and the coin is a retained cud. If it has only moved away, the die is split.

Notable Examples

Error-Ref illustrates the type with these U.S. coins, among others:

1980-P Jefferson nickel — a very wide median split across the obverse.
1973-D Lincoln cent — struck by a die with a wide median split that was also capped, combining the two errors that so often travel together.
1973-D Jefferson nickel — a narrow median split on the reverse.
1981 (P or D) Jefferson nickel — an asymmetrical split on the obverse.

Collecting Tips

Measure the width. The difference between a heavy rim-to-rim crack and a split die is half a millimetre. A loupe with a reticle, or a good photograph beside a scale, settles it.
Check for movement before calling it a split. A wide crack around an edge section can be misread as a retained cud, or the reverse. Look at the design inside: raised or offset means retained cud; merely spread means split.
Look for a cap. A coin struck by a split die that also shows signs of a die cap — a stretched, distorted or incomplete design on that face — shows two errors that Error-Ref notes often occur together.
Follow the die. A split die widens with use, so coins from the same die at different stages show its progression.

Split Die