The Main Diagnostics Collectors Should Check
A clipped planchet error can look like a bite was taken out of a coin. Damage can look similar at first glance. A genuine clip starts while the metal blank is being prepared, before the design is struck. Damage happens after the coin leaves the Mint.
A curved clip often has a smooth missing edge, metal flow near it and a weak rim opposite it. Straight and ragged clips need checks suited to their shapes. Cuts, tool marks, bends or scraped metal may suggest damage. One clue alone does not prove a mint error.
Do not clean, file, bend or polish the coin. Photograph both sides, the edge and the possible clip. Also photograph the rim directly opposite it. Use those views to decide whether the coin needs a closer look.
What Is a Clipped Planchet Error?
A planchet is a metal blank prepared for striking. A clipped planchet error begins while blanks are punched from a strip of metal. If the strip feeds incorrectly, a punch can overlap an earlier hole or reach past the strip's edge. That can leave metal missing before the coin is struck.
Collectors use names such as curved clip, straight clip, ragged clip and incomplete clip. An incomplete clip can leave a curved blanking line without any metal missing. The question is whether the edge or blanking mark formed before the strike. PCGS explains these clip types.
Look for these signs before calling it an error:
- Shape of the missing area: curved clips are often smooth and rounded; straight clips can look like a clean flat cut from the edge of the strip.
- Metal flow near the clip: the strike can pull metal toward the open area, so design and rim details near the clip may look stretched or weak instead of sharply cut.
- Blakesley effect: many genuine curved clips show weakness, flatness, or missing rim detail directly opposite the clip.
- Edge texture: a real mint-made clip should not look like fresh plier damage, a saw cut, a drilled hole, or a jagged break from circulation.
- Overall coin shape: a clip should make sense as a blanking error, not as a random chunk torn out after the coin circulated.
Blakesley effect in plain English: before a coin is struck, its blank normally passes through a rim-raising step called upsetting. If part of the blank is missing, the area opposite the clip may not receive normal pressure. That can leave a weak or flat rim. It supports a genuine clip, but the edge and nearby design still need to be checked. NGC explains this pre-strike rim process.
Clipped Planchet vs Damage: Quick Comparison
| What You See | More Like a Real Clip | More Like Damage |
|---|---|---|
| Missing edge shape | Curved, straight or ragged edge that fits the metal-strip process; an incomplete clip may leave a line without missing metal | Random gouge, torn bite, drill mark, jagged break, or tool-shaped cut |
| Rim opposite the missing area | May show weak or flattened rim detail from the Blakesley effect | Often looks normal if the coin was damaged after striking |
| Metal around the missing area | Can show natural strike flow toward the open space | May show sharp raised burrs, scraped metal, bending, or fresh-looking exposed surfaces |
| Design near the missing area | May be weak or distorted because the blank was incomplete during the strike | Design may be cut through abruptly after it was already struck |
| Value potential | Depends on coin type, clip size, condition, appearance and confirmation that the error is genuine | Usually worth face value or normal collectible value only |
Common Types of Clips
Curved clip: the classic crescent-shaped missing area. This often comes from a blank being punched too close to a previous punch hole in the metal strip.
Straight clip: a straight missing section that can happen when the blank is punched from the edge of the strip.
Ragged clip: an irregular missing area. It can come from a rough or untrimmed edge, or a defect inside the metal strip. Its shape alone does not prove either a genuine clip or damage.
Incomplete clip: a partial blanking impression rather than a fully missing piece. These need careful inspection because they can be confused with scratches or other marks.
How to Photograph a Possible Clip
- Take one straight-on photo of the front (obverse) and one of the back (reverse).
- Take a close-up of the missing area.
- Take a close-up of the rim directly opposite the missing area.
- Take an edge photo if the coin has grooves (reeding) or a visible rim change.
- Include a normal coin of the same type and face value beside it for scale when possible.
Good photos help separate a possible mint error from a coin that was cut, clipped, bent, drilled, or damaged in circulation. They also make it easier for a dealer, error specialist, or grading service to give a more useful opinion.
Is a Clipped Planchet Coin Valuable?
Some clipped planchet errors sell for more than a normal coin, but not every clip is expensive. Value depends on the coin type, date, mint mark, clip size and condition. A visible date and attractive appearance can also matter. Buyers need to be sure the error is genuine.
A dramatic clip on a collectible coin can be more interesting than a tiny clip on a common circulated coin. Authentication matters more when the coin is valuable, the clip is unusual, or there are signs that the coin may have been altered.
When Should You Get a Second Opinion?
Ask for a closer look if the clip is large or the coin is otherwise collectible. A weak rim opposite a possible clip can also justify checking further. Expert confirmation matters when it would affect a sale. For common coins with tiny questionable bites, grading can cost more than the coin is worth.
If you are comparing other mint-error types, start with CoinHub's penny error list, quarter error guide, nickel error list, and dime error guide. A missing edge is only one possible error family, and many coins that look strange are actually post-mint damage.
Clipped Planchet Error FAQ
Can a clipped planchet error be faked?
A missing edge can be created after a coin leaves the Mint, so yes, damaged coins can imitate clips. That is why collectors check the rim, metal flow, edge texture, and opposite-side weakness before calling it a mint error.
Does every genuine clipped planchet show the Blakesley effect?
No. It is a strong diagnostic when present, especially on curved clips, but it is not the only thing to check. The size, location, coin type, and strike characteristics all matter.
Are clipped planchet errors the same as off-center strikes?
No. A clipped planchet error starts during preparation of the metal blank. A complete clip leaves metal missing; an incomplete clip may leave only a blanking mark. An off-center strike happens when the blank is not centered between the dies, the tools that stamp the design.
Should I clean a possible clipped planchet coin?
No. Cleaning can reduce value and make diagnostics harder to read. Leave the coin as found and document it with clear photos.
Bottom Line
Look at the edge, rim and nearby design together. A weak opposite rim can support a genuine clip, but it does not prove one. Fresh tool marks, bending or scraping may point to damage. An irregular edge alone is not enough to decide.