Home/Field Notes/Stamp Grading and Expertization Explained

Grading and expertization get used interchangeably in listings, and they are not the same thing. Grading is an opinion about how good an example is. Expertization is an opinion about whether it is what it claims to be. A stamp can be beautifully centred, brilliantly fresh, and a forgery. It can also be genuine, correctly identified, and in condition nobody wants.

Understanding which question a given piece of paperwork answers — and which one it pointedly does not — is the difference between paying for information and paying for reassurance.

The two questions, kept separate

Every serious opinion on a stamp answers one or both of two questions, and they are answered by different processes with different costs and different limits.

The condition vocabulary, precisely

Traditional grading terminology describes centering — where the printed design sits within its margins or perforations. It is the most visible attribute of a stamp and therefore the one sellers lead with, which is exactly why it should not be the only thing you read.

• Average — design noticeably off-centre, with perforations cutting into or nearly into the design on one or more sides
• Fine — design clear of the perforations but distinctly closer to one side
• Very Fine — design comfortably clear on all sides, with only modest imbalance
• Extremely Fine — design close to centred, with balanced margins
• Superb — essentially perfect centering with balanced margins on all four sides

Hyphenated intermediates such as Fine-Very Fine are standard usage and describe an example sitting between two grades. Third-party graders express the same continuum on a numeric scale anchored to these adjectives, which allows finer distinctions but does not change what is being measured.

On imperforate stamps, margins replace centering

An imperforate stamp is graded on its margins: how much blank paper surrounds the design on each of four sides, and whether the margins are balanced. Four clear margins is the benchmark. Anything cut into the design is a serious condition problem, and margins are routinely added, extended, or rebuilt — which makes margin assessment an expertization question as much as a grading one.

Gum: five states that are priced very differently

Gum is where the largest hidden price differences live on mint material, and where the most common fraud sits.

The most useful regumming check is the perforation tips. On a genuinely never-hinged stamp the gum was applied to the sheet before perforation, so it stops at the paper's surface. Gum that runs over or wraps around the tips of the perforations was applied after the stamp was separated. Other indicators include an unnaturally uniform sheen, gum that fluoresces differently from known original gum of the same issue, and a back whose apparent freshness does not match the wear on the face.

Faults: the part that is left out of descriptions

Faults are physical defects, and they are assessed separately from grade. A stamp can carry a high centering grade and still be unsound, which is why grading services note faults alongside the grade rather than folding them into it.

• Thin — paper removed from the back, usually by hinge removal. Shows bright against transmitted light and dull under raking light
• Filled thin — a thin repaired with added material. Shows as a flat, texturally different patch and frequently fluoresces differently
• Tear — visible against light; closed tears are a standard repair and are detectable by texture and by fluorescence
• Crease — a fold line in the paper, sometimes visible only under raking light or in fluid
• Pinhole — a small perforation of the paper, often from historic album mounting
• Short or pulled perforation — a perforation tooth missing or torn away
• Reperforation — perforations added or reshaped to improve apparent centering; an alteration rather than a fault
• Stain, toning, foxing — discolouration from storage conditions, humidity, or contact with acidic material
• Scuff or abrasion — surface damage to the printed design
• Cleaned or added cancel — alteration to the cancellation, either removing it or adding one to a stamp that never carried it

What third-party grading does and does not deliver

Grading services assess an example against a defined standard, assign a grade, note faults, and typically encapsulate the stamp in a sealed holder with the opinion printed on the label. The benefits are real: a consistent standard, a durable record, protection from handling, and a description that transfers with the item.

The limits are equally real, and worth stating plainly:

• A grade is an opinion, not a measurement. Resubmission can produce different results, and standards drift over time.
• Encapsulation prevents direct examination. You cannot check gum for regumming, feel for engraving relief, or examine the back under raking light through a holder. You are trusting the grader's examination in place of your own.
• A high grade on a common stamp does not create scarcity. In areas where a great deal of high-grade material exists, the grade adds little.
• Not every area's market uses grading. Classical European and postal-history markets run largely on expertization certificates instead, and an encapsulated holder may add nothing there.
• The service fee is real money. Below a threshold that varies by area, grading costs more than it adds.

Expertization: how it works and how to read it

Expertizing bodies exist to answer the genuineness and identification question. The established ones operate with committees of area specialists, maintain reference collections of known genuine and known forged material, and issue a signed, dated opinion with a photograph of the item examined.

A certificate is transferable and travels with the item, which is why it is worth preserving carefully and photographing alongside the stamp. It is also why a stamp offered "with certificate" but where the certificate is not shown should be treated as uncertified until the document is in front of you.

When submission is worth it

The decision is a cost-benefit calculation, and for most material the answer is no.

Submit when: the identification depends on a distinction that is commonly forged; the value gap between adjacent varieties is large; the item is a catalogued error; a valuable base stamp carries an overprint or surcharge; the area has a documented forgery problem; or you intend to sell into a market where buyers expect certification and will discount its absence.

Do not submit when: the item is common; the fee approaches or exceeds the value at stake; the area's market runs on direct examination rather than paperwork; or you are seeking confirmation of something you already know because you want the reassurance rather than the information.

How the market prices all of this

Grade, soundness, and certification interact rather than adding up. A useful way to think about it is as a sequence of gates: a stamp must first be genuine and correctly identified, then sound, then well-centred. Failing an earlier gate cannot be compensated by excelling at a later one.

That ordering explains market behaviour that otherwise looks irrational — why an average-centred certified example can outprice a superb uncertified one in a forged area, why a small thin removes more value than a full grade step, and why postal-history buyers are indifferent to stamp centering that stamp buyers would reject.

The practical instruction that follows is simple. Establish identity first, soundness second, grade third, and price last. Any other order lets the number lead the assessment, and once that happens the assessment is no longer worth having.

Common questions