Error Coin Grading and Certification: PCGS, NGC, ANACS, and CONECA

What certification does for an error coin

Certification places the coin in a tamper-evident holder with the grading service's opinion of three things: that the coin is genuine, that the error is genuine and of the stated type, and the grade. For an ordinary coin, the first and third of those are what matter. For an error, the second is the whole point. The market for errors is small and expert, and an uncertified error trades at a steep discount or does not trade at all, because the buyer has to believe the seller's claim about what the coin is.

Certification also describes. The label on a certified error states the error type — off-center, clipped planchet, struck through, doubled die with its attribution — in the service's standard vocabulary, which means two certified coins of the same type are comparable in a way two raw coins never are. That comparability is what makes sold-listing research possible.

The services and how they handle errors

PCGS certifies errors and describes the type on the label under its Mint Error designation. It attributes doubled dies and other die varieties as an add-on service, using standard references. Its population report lists certified errors by type, which is a useful research tool for rarity.

NGC certifies errors and describes the type on the label, and attributes varieties through its own variety program. NGC's label vocabulary differs slightly from PCGS's, so learn both. NGC handles world-coin errors more routinely than PCGS, which matters for foreign wrong-planchet errors.

ANACS has the longest association with error and variety collecting of the major services and is often the choice for minor varieties, where its lower fees make certification of an inexpensive coin viable. ANACS holders trade at a discount to PCGS and NGC on ordinary coins, but in the error and variety community the discount is smaller because the attribution expertise is respected.

ICG certifies errors and is used for lower-value pieces where fee matters most. It trades at a discount similar to ANACS.

CONECA is not a grading service. It is the collector organization that maintains the master listings of die varieties, and its examiners attribute coins for a fee, returning them raw with an attribution certificate. A CONECA attribution is authoritative for what the die is, but it is not a holder and it is not a grade; many collectors get CONECA attribution and then certification.

Certification versus attribution

Certification says the coin and the error are genuine and assigns a grade. Attribution says which listed die the coin came from. They are separate services, separately priced, and a coin can have either without the other.

Planchet and striking errors — clips, laminations, off-centers, broadstrikes, brockages, struck-throughs — are certified but not attributed, because they are unique and have no catalog listing. The label describes the type and sometimes a measurement, such as the percentage off-center. Die errors — doubled dies, repunched mint marks, cuds — can be attributed, because they repeat and are listed. An attributed doubled die's label carries the reference number; an unattributed one says doubled die and nothing more, which is worth less because the buyer cannot compare it to anything.

If you have a doubled die, attribute it before or during certification. If you have a striking error, certification alone is what you need. The doubled die hub covers attribution in detail.

Reading a certified error label

The label has the same elements as any slab plus the error description. Denomination and date. Mint mark. The error type in the service's vocabulary. For die varieties, the attribution reference. For off-centers, often a percentage. For struck-throughs, sometimes the object. Then the grade, with a Mint State or circulated designation, and for errors with damage, a Details designation with the reason.

Errors are graded on the same 70-point scale as any coin, on the same criteria: strike, luster, surfaces, eye appeal. An error that has been cleaned receives a Details grade like any other coin, and the error premium survives that in part but not in full. The sister site GradedCoins.co covers the scale and the label vocabulary for grading in general.

Verify every certified error's number against the service's database before you buy, and compare any image in the record to the coin. Error coins are targets for counterfeit holders precisely because the error premium makes them worth faking.

Is certification worth it for your coin?

The test is the same as for any coin: does the certified sold price exceed the raw sold price by more than the total cost of submission? For errors the answer is more often yes than for ordinary coins, because the raw discount is so large. A dramatic off-center, a major doubled die, a wrong-planchet error, a brockage — anything that sells for a meaningful amount certified — is almost always worth certifying, because uncertified it may not sell at all.

The answer is more often no for minor errors: small die chips, minor clips, small struck-throughs, minor repunched mint marks. For those the fee can exceed the certified value, and ANACS or ICG may be the only economical route. Tiny die chips are the canonical example of an error not worth certifying.

1. Confirm the error using the identification hubs. Do not submit a look-alike; the not-an-error hub lists what the services will reject.
2. Search sold listings for certified examples of the same type and denomination in a similar grade.
3. Search sold listings for raw examples of the same type, if any exist.
4. Add up the fee for the tier the coin is eligible for, shipping and insurance both ways, and any attribution charge.
5. If certified minus raw exceeds the total, submit. If not, do not, unless you have a non-financial reason.

How to submit an error

The mechanics are the same as any submission: membership or dealer, form, declared value, tier, packaging, insured shipping. Three things are specific to errors.

Say what you think it is. The submission form has a field for the error type or variety you are claiming. Fill it in. The service will confirm or correct it, and a coin submitted without a claimed error type may be graded as a normal coin without the error noted.

Order attribution if it applies. For a doubled die, repunched mint mark, or other die variety, order the attribution service and state the reference number you believe applies. If you are not sure, state that it is unattributed and ask for attribution.

Declare value honestly. Errors are hard to value, but the declared value sets the tier, the fee, and the insurance cap. Use sold listings for certified examples of the same type as your guide.

Photograph the coin thoroughly before you ship — including the edge — and keep the images. If the coin comes back described differently from what you expected, those photographs are your record. The raw error return checklist covers what to check when it arrives.

When the service disagrees with you

The most common outcome for a first error submission is that the service identifies the coin as a look-alike: machine doubling, die deterioration, damage, an altered coin. The coin comes back in a holder that says so, or raw with a note, and the fee is spent. This is not the service being wrong. It is the reason the not-an-error hub exists.

Less commonly, the service confirms the error but describes it differently from your claim — a different percentage, a different attribution, a different type. Read the label carefully, look up the service's definition, and compare to your coin. The service has seen thousands of examples; you have seen one. If you still disagree after that, the services have review processes, and CONECA can provide an independent attribution opinion. Resubmitting the same coin with the same claim to a different service in the hope of a different answer is expensive and rarely works.

Tiers, declared value, and fees for errors

Errors go through the same tier system as any coin. The tier is set by declared value, and errors are harder to value than ordinary coins because the population at any type and grade is small and the sold data is thin. The rule is still to declare honestly, using sold prices for certified examples of the same type as your guide, and to accept that a dramatic error may push the coin into a higher tier with a higher fee. Under-declaring an error to reach an economy tier risks the service re-tiering it, and it caps your insurance claim if the coin is lost, which for a one-of-a-kind striking error is a loss you cannot replace.

One practical difference: the services may ask you to declare value for the coin as an error, not as a normal coin of that date, because that is what they are insuring and what determines the grader who examines it. A common-date cent that is a dramatic off-center is not a common-date cent for tier purposes. Declare it as what you believe it is, and be prepared for the service to adjust the tier if it agrees the error is more significant than you declared.

The services also handle problem errors — cleaned, damaged, or environmentally affected pieces — under the same Details rules as any coin. If your error has a problem, it will come back with the error described and the problem noted, and the fee is the same. Decide before you submit whether the error premium on a Details coin justifies the cost; for a dramatic striking error it often does, and for a minor die variety it usually does not.

This site does not quote fees, because they change and because the services publish current schedules. Read the schedule the day you submit, note the error and variety add-on charges separately, and add shipping and insurance both ways. The sister site GradedCoins.co covers tiers, turnaround, and the submission process for grading in general, and its guidance applies to errors with the additions on this page.

Using population reports for errors

The major services list certified errors in their population reports by type, and for die varieties by attribution. For an error collector these reports are the closest thing to a rarity census that exists. A search for a type and denomination shows how many the service has certified at each grade, which tells you whether the coin in front of you is one of dozens or one of thousands. Cross-reference with sold listings and you have both halves of a value estimate: how scarce, and what the scarce ones sold for.

The reports also show what the services actually certify, which is useful when you are deciding how to describe a coin on a submission form. Browse the list of error types for your denomination and use the service's own vocabulary; a submission that calls a broadstrike an off-center will be corrected, but a submission that uses the term the service uses will move faster and come back labeled the way you expect.

Errors on some denominations are far more common than on others, and the reports make that obvious. Modern cents and nickels dominate the certified populations because they are struck in the greatest numbers and searched most heavily. Silver dollars, gold, and early copper are scarce as errors because fewer were struck and because the mint's quality control on high-value coins was tighter. That difference is why the same error type can be inexpensive on one denomination and a major rarity on another, and it is why the search for sold prices must always be denomination-specific.

Two cautions. Population counts overstate rarity at the top because coins are resubmitted and each submission can add an entry. And population counts understate rarity at the bottom because minor errors are not worth certifying, so the certified population of a common minor error is a small fraction of what exists. Read the report as a ceiling on rare types and as a floor on common ones, and let sold prices settle the rest.

Buying certified errors

Certification removes the authenticity question but not the value question. Two certified off-centers at the same percentage on the same denomination can differ in price because one shows the full date and the other does not, or because one is on a scarce date. Two certified doubled dies with the same attribution differ by grade and by how strong the doubling is on that particular strike. Read the label, look at the coin, and research the specific combination.

Sold listings for the same type, denomination, service, and grade are the reference. Filter to sold, ignore asking prices, and note the range. Asking price is not value is the rule for errors even more than for ordinary coins, because the small market lets optimistic sellers list unrealistic prices for years.

Certified errors are found by searching the type name — off-center strike PCGS, clipped planchet NGC, doubled die ANACS — and the results are a running education in what the services certify and how the market prices it.