Collector Basics
How to Identify a Stamp
A practical step-by-step method for narrowing down an unknown stamp safely and accurately.
Last updated: July 2026
Identifying a stamp is usually a process of narrowing down clues rather than matching one photograph. Start with what can be seen clearly: the issuing country or authority, denomination, currency, wording, portrait or design, colour, perforations and cancellation.
Once the broad issue has been found, details such as watermark, paper, printing method, overprint and condition may distinguish similar stamps.
Work carefully. Do not clean the stamp, alter it, soak it unnecessarily or remove it from an original envelope merely to identify it.
Quick answer: how do I identify a stamp?
Begin with the facts visible on the stamp itself. In order of priority:
- Country or issuing authority — look for a printed name, initials or recognisable portrait
- Denomination and currency — record the exact figure and unit as printed
- All visible inscriptions — copy every word, abbreviation or overprint exactly as it appears
- Central design or portrait — note the subject: monarch, person, animal, building, map or event
- Perforated or imperforate edges — punched holes or straight cut margins
- Overprints and cancellations — additional text applied after printing, and any postmark
Work from this visible evidence towards a catalogue identification. Do not identify by colour alone — colour can appear different because of screens, scans, fading and lighting. Do not assume that two visually similar stamps are the same issue: they may differ by watermark, perforation, paper or printing in ways that affect their catalogue identity entirely. Do not assume rarity before checking the stamp against a recognised catalogue.
Photographs and online listing descriptions cannot confirm every physical characteristic. A full identification may require physical examination of the back, watermark, gum and perforations.
10-minute stamp identification checklist
Use this as a starting checklist to record what you can see. Completing it does not guarantee a full identification — some stamps require catalogue comparison, physical measurement or specialist advice — but it ensures you have recorded the key facts before searching.
Before you start
- Handle loose stamps with stamp tongs where possible.
- Produce a scan or photograph of the front and back before doing anything else.
- Keep stamps attached to original covers or postal stationery.
- Record anything written on an album page, old packet or certificate — but do not assume it is correct.
- Do not clean, flatten, soak or alter the stamp before examining it.
The identification sequence
- 1
Find the country or issuing authority
Look for a country name, postal administration or territory printed on the stamp. This is the most direct starting point.
Some stamps use abbreviations, another language or only a monarch's portrait without naming the country. Great Britain traditionally does not print the country name on ordinary postage stamps.
Colonial and occupation issues may show an overprint naming a different territory from the original design.
- 2
Record the denomination and currency
Write down the exact denomination as it appears. Currency terms such as penny, cent, franc, mark, rupee, peso or shilling can narrow the search considerably.
Do not confuse a denomination with a year, plate number or surcharge.
- 3
Read every visible word
Note all inscriptions, initials, names and overprints exactly as printed. Search unfamiliar wording rather than guessing its language or meaning.
Wording such as POSTAGE, REVENUE, AIR MAIL, TAXE, OFFICIAL or SERVICE may indicate the stamp's purpose.
- 4
Describe the central design
Record the monarch, person, animal, building, map, coat of arms or event shown. Note whether the design is a portrait, pictorial, commemorative or definitive.
Similar designs were often used across many denominations and years. The design alone is not enough to identify the specific stamp.
- 5
Check whether it is perforated
Imperforate stamps have cut edges rather than punched holes. If the stamp has perforations, measure them with a perforation gauge where identification depends on the measurement.
Do not estimate precise perforation gauges from an online image. Trimmed perforated stamps can sometimes resemble imperforate stamps, so inspect the edges carefully.
- 6
Examine the watermark safely
A watermark is a design formed in the paper and can distinguish stamps that otherwise look identical. First try viewing the back against a dark surface or in safe angled light.
Purpose-made watermark detectors — such as a watermark tray with black backing — can help. Specialist watermark fluid may be used where appropriate, but only according to the product's own safe-use instructions and only when it is suitable for the stamp in question. Do not use lighter fluid, benzene, water or improvised solvents.
- 7
Examine printing, overprints and cancellations
Different printing methods produce different surface characteristics visible under magnification. Overprints and surcharges may change the issuing authority, denomination or purpose.
Cancellations can indicate place, date or postal use, but heavy marks may obscure important identification details. Forged or altered overprints and cancellations do exist.
- 8
Compare with the correct catalogue or specialist reference
Once country, denomination, design and approximate date are known, use a catalogue covering that area and period.
Match the full catalogue description, not merely the illustration. Check watermark, perforation, paper, colour and issue date where applicable. A catalogue number should be assigned only after the stamp matches the listing details.
- 9
Consider paper, printing, gum and colour when narrowing further
Once the broad identification is established, paper thickness and type, printing method (line-engraved, lithography, photogravure or typography), gum type and precise colour or shade may distinguish otherwise similar catalogue entries.
These details are normally considered only after the broader identification has already been narrowed to two or more similar catalogue listings. Do not attempt to assign a precise shade solely from a screen image or ordinary photograph — scanning, lighting, fading and display calibration can all alter apparent colour.
Do not use destructive tests to assess paper, gum or printing.
Understanding what type of stamp you have
Not every stamp-shaped item is a postage stamp. Confusing a revenue stamp, postage due, official issue or Cinderella label with a postage stamp is a common identification mistake. Confirm the type before searching catalogues, as most philatelic catalogues cover postage stamps and related postal issues, while revenue, local and Cinderella material requires its own specialist references.
Postage stamps
Pay postal charges. Most stamps encountered in collections are postage stamps.
Revenue or fiscal stamps
Pay taxes or government fees. They can resemble postage stamps closely in design and format but serve a different purpose. Some revenue stamps were also permitted for postage use during specific periods.
Postage due stamps
Mark unpaid or underpaid postage. Often inscribed TAXE, POSTAGE DUE or equivalent. Typically collected from the recipient rather than the sender.
Official or service stamps
Used by government departments. Often overprinted OFFICIAL, SERVICE or a departmental name. Many countries produced official issues alongside their standard postage series.
Local or private-post stamps
Issued by local posts or private carriers for local delivery. Not always valid for national or international mail. A substantial specialist area with its own catalogues.
Charity or semi-postal stamps
Carry a face value for postage plus a surcharge for a charity or fund. The surcharge is usually indicated by a plus sign followed by an amount.
Cinderella labels
A broad term covering stamp-shaped labels, seals, poster stamps, exhibition labels and non-postal material that resembles postage stamps but has no postal validity. Misidentifying a Cinderella as a postage stamp is a common mistake.
This list covers the principal categories. Stamp-like material spans a wide specialist field and this guide cannot cover every variant. If the material does not match a standard postage-stamp description, consult a specialist reference for the relevant category.
Common identification mistakes
- Matching only by colour
- Trusting the first image-search result
- Ignoring watermark or perforation differences
- Assuming an album label is correct
- Treating an overprint as automatically genuine
- Confusing postage stamps with revenue, fiscal, charity or local labels
- Assigning a rare variety from a blurred photograph
- Removing a stamp from a cover
- Treating an asking price as proof of identity or value
- Assuming visual similarity proves two stamps are the same issue
- Treating a marketplace listing's identification or catalogue number as authoritative
Create a clear scan first
For a loose stamp, a flatbed scanner produces a more reliable image than a handheld camera or phone. Scanners deliver consistent, even illumination, accurate scale, and enough resolution to examine printing, perforations and paper detail closely.
Scanner settings and practice
- Scan at 600 ppi in colour mode with no automatic enhancement or sharpening applied.
- Scan front and back as separate files so both can be examined clearly.
- A flatbed scanner produces a consistent, evenly lit image that reveals printing detail, perforation shape and paper quality.
- Scan at actual size initially. A separate high-resolution crop of inscriptions or overprints is useful for small lettering.
- Name files clearly: country, approximate date, front or back.
When a camera or phone is more useful
A camera or phone is the right tool when the stamp cannot or should not be placed on a scanner — on a cover, album-mounted, or too fragile to move.
- A camera or phone is more practical when the stamp is on a cover or envelope that should not be disturbed.
- Album-mounted stamps that cannot be safely removed are better photographed than handled.
- Photograph in even, diffuse natural light. Avoid direct sunlight, which creates glare and false colour.
- Include a ruler or scale in at least one photograph.
- Take a close-up of inscriptions, overprints and cancellations in addition to the full frame.
- Photograph faults clearly rather than concealing them.
When specialist help may be needed
Specialist help may be appropriate when:
- the stamp may be a scarce variety
- watermark or printing differences are difficult to determine safely
- an overprint or cancellation may be forged or altered
- the stamp appears repaired, reperforated or regummed
- the identification materially affects potential value
- a recognised certificate would improve buyer confidence
StampSeeker does not authenticate stamps.
What identification cannot tell you
Even a correct identification does not answer every question a collector or seller may have.
A correct identification does not confirm authenticity
Knowing the catalogue number does not tell you whether the stamp is genuine, forged, altered, repaired or regummed. Those questions require physical examination, specialist knowledge and — for material of significance — an expertising certificate.
Catalogue value is not the same as achievable market value
Catalogue values are reference points for relative scarcity and identification, not guaranteed sale prices. What a stamp actually achieves depends on its condition, demand at the time of sale, the selling route and buyer competition. For more detail, see the valuation guide.
How to Value a Stamp CollectionMarketplace listing descriptions can be incorrect
Stamps are frequently misidentified in online listings. Assigned catalogue numbers, country attributions and variety descriptions from individual sellers should be treated as starting points for your own research, not as authoritative identifications.
Photographs may not reveal everything
Watermarks, paper differences, gum condition, repairs, reperforations and alterations may all be invisible or misleading in a photograph. A full physical examination is required for any identification that depends on these characteristics.
StampSeeker does not authenticate or guarantee identifications
StampSeeker helps you search, compare and discover — it does not verify that a stamp is what it appears to be, and does not guarantee the accuracy of listings found through search.
Use StampSeeker to narrow the search
Useful search terms combine two or more visible clues — country, denomination, monarch or design. Try combining what you can read on the stamp.
Search stamps on StampSeekerRelated guides
Frequently asked questions
Can a stamp be identified from a photograph?
Sometimes, but the back, watermark, perforations, paper and physical condition may all be essential for a confident identification.
Why can two stamps look identical but have different catalogue numbers?
They may differ by watermark, perforation, paper, printing, shade, overprint or another specialist feature invisible in a photograph.
Is colour enough to identify a stamp?
No. Lighting, fading, scanning and screen settings can make colour unreliable as a sole identifier.
Should I remove a stamp from an envelope?
No. The complete cover may preserve postal-history evidence and can be more important than the loose stamp.
Can an album label be trusted?
Treat it as a clue, not proof. Collections are often misidentified or stamps are moved between album spaces.
When should a stamp be expertised?
When authenticity, a scarce variety, an overprint, alteration or condition materially affects the stamp's importance or value.