Stamp Condition and Grading: The Factor That Decides the Price

The same stamp in two conditions can differ in price by a factor of fifty. Grading is not a formality — it is most of the valuation.

If you remember one thing about stamp values, make it this: condition matters more than age, and usually more than rarity. Two copies of the same catalogue number, same country, same year, routinely differ in price by a factor of fifty. Nothing about the stamps differs except their physical state.

Collectors assess that state along four independent axes. A stamp can be excellent on one and poor on another, and buyers price all four.

Centering

How evenly the printed design sits within its perforations. Sheets were not always cut and perforated precisely, so the design drifts. The grading vocabulary describes how far.

Grade	What it looks like
Superb	Design perfectly centred, margins even on all four sides
Extremely Fine	Very nearly centred, margins clearly clear of the design
Very Fine	Slightly off centre, but design well clear of the perforations
Fine	Noticeably off centre, design close to perforations on one or two sides
Average	Design touching or cut into by the perforations

On classic material, moving from Fine to Extremely Fine can multiply the price several times. This is also why catalogue values are frequently misread: the catalogue quotes a specific grade, and most stamps in most albums sit below it.

Gum, for unused stamps

The adhesive on the back is part of the object, and its state is a grade of its own.

Mint never hinged (MNH) — full original gum, undisturbed. The premium grade.
Mint hinged (MH) — original gum with a hinge mark or remnant. Worth a fraction of never hinged for the same stamp.
Original gum, disturbed — gum present but skipped, glazed or partly removed.
No gum / unused — gum washed off or never present.
Regummed — fresh gum applied later to imitate MNH. Worth less than an honest hinged copy once identified, and it usually is identified.

Do not try to improve gum. Removing a hinge remnant badly creates a thin, which costs far more than the hinge mark did. Leave hinges alone unless you know exactly what you are doing.

The cancel, for used stamps

A postmark is not automatically a defect — it is evidence the stamp did its job — but its character matters. What buyers want is light, clean and legible: a cancel that leaves the design readable, ideally showing a clear date and office. What they discount is a heavy black obliteration across the face, or smudging that obscures the portrait or vignette.

Some cancels add value in their own right. Unusual offices, notable dates, first or last days of a service, and cancels tied to interesting postal routes are collected for themselves, particularly when the stamp is still on its original cover.

Faults

The category that removes value fastest. Check every stamp you believe is worth money for all of these:

Thins — reduced paper on the back, usually from careless hinge removal. Hold to a light; a thin shows as a bright patch.
Creases and bends — visible as lines when the stamp is tilted under raking light.
Tears and nicks, including tiny ones at the edge.
Missing perforation teeth — count them along each side.
Pinholes, from the era when stamps were pinned to documents.
Toning, foxing and staining — brown discolouration from damp or acidic paper.
Fading — from light exposure, permanent.
Repairs — reperforating, filled thins, closed tears. Treated as faults, not as fixes, and disclosed repairs sell far better than undisclosed ones.

How to examine a stamp properly

Work over a clean surface in good, even light, and use stamp tongs rather than fingers.
Look at the front under magnification for centering, colour freshness and design damage.
Turn it over. Most faults are visible only from the back.
Hold it against a light to find thins and repairs.
Tilt it under raking light to reveal creases and bends.
Count the perforation teeth on each side.
Write down what you found, including the faults. An honest grade is worth more in a negotiation than an optimistic one, because the buyer will find them anyway.

Why honest grading pays

It is tempting to grade generously, and it costs money twice. A stamp described better than it is comes back from an online buyer, with the return postage and the feedback attached. In front of a dealer, an inflated self-assessment simply signals inexperience and makes every subsequent number in the conversation worse.

The seller who says "very fine, but there is a light crease at the upper right and the gum is disturbed" is quoted as someone who knows what they have. That is a better position than the one where the dealer has to tell you.

Common questions

What does MNH mean?

Mint never hinged — an unused stamp with its original gum, never mounted with a hinge. It is the top gum grade and commands a substantial premium over the same stamp hinged.

Is a hinged stamp ruined?

No. Hinging was standard practice for most of the twentieth century and a lightly hinged stamp is perfectly collectable. It is simply worth less than a never-hinged copy of the same stamp.

How do I check for a thin?

Hold the stamp against a light, or lay it face down in watermark fluid. A thin shows as a brighter patch where the paper is reduced. Check every stamp you believe is valuable this way.

Does a nice postmark help or hurt?

A light, clean, legible cancel that leaves the design readable is worth more than a heavy smudge. A cancel that is historically interesting — an unusual office, a notable date — can add value on its own.