A stamp perforation is a row of small holes punched between stamps to make them easier to tear from a sheet.
The Story Behind Stamp Perforations
When stamps had to be cut out by hand
When the first postage stamp appeared in 1840, the famous Penny Black, it completely changed how people sent mail. Sir Rowland Hill’s idea was brilliant and simple, but there was one big problem no one had thought about yet: how to separate the stamps.
Each sheet of Penny Blacks had to be cut apart by hand. Post office clerks used scissors, knives, or even the edge of a ruler to slice between designs, which was as slow and messy as it sounds. Corners got snipped off, borders went wonky, and customers were often left with half a stamp missing. For busy post offices, it was a nightmare.
Pretty soon, people realised that if stamps were going to work on a large scale, there had to be a quicker and cleaner way to separate them.
The ingenious Mr Archer
That is where Henry Archer comes in. An Irish engineer with a flair for invention, Archer started experimenting with ways to automate the process in the late 1840s. His first idea, patented in 1847, was a system called rouletting. Instead of punching out holes, it made tiny cuts between the stamps so you could tear them apart easily.
It worked in principle, but there was a big snag. The machine’s blades kept slicing into the surface underneath the stamp sheets, wearing it out quickly and making the process too costly for large-scale production.
Never one to give up, Archer went back to his workshop and rethought the whole thing. The result was the first true perforating machine, which used metal pins to punch neat, evenly spaced holes between each stamp. It solved the wear and tear problem and looked far tidier too.
Even so, it took a few years to convince the powers that be. The British government was famously slow to adopt the idea, and it is said that Rowland Hill himself was not particularly supportive, perhaps because it was not his invention. In 1853, the Treasury finally saw sense and bought Archer’s patent for £4,000. The following year, in 1854, Britain issued its first perforated stamps, the Penny Red.
From there, the idea spread fast. Just three years later, the United States released its first perforated issue, the 3¢ Washington, and before long, perforations had become the standard for stamp production across the world.
How stamps got their teeth
Once perforations became the new normal, different machines were designed to do the job, and they each left their own tell-tale marks behind. Collectors can often tell which type of machine was used just by looking at how the holes line up in the corners.
Line perforation
This was one of the earliest methods and it did things one row at a time. The machine would punch a straight line of holes, either across or down the sheet, then the operator had to turn the paper 90 degrees and feed it through again to make the holes in the other direction.
You can imagine how easy it was for things to go a little wonky. If the sheet was not lined up perfectly, the corners would not meet neatly, and that is exactly what you will spot on many older issues. The corners might overlap slightly, or one side might look just a touch out of square.
That irregularity is actually a clue. It tells us a stamp was made using line perforation rather than a more modern, tidy method.
Comb perforation
To make life easier, the comb perforator was invented. This machine had a row of pins across the top and several shorter rows hanging down, shaped a bit like a hair comb. When the machine came down on a sheet of stamps, it punched three sides at once, the top edge and both sides. Then the sheet was moved down one row and the next set got punched.
Because it did not have to be turned, the alignment was much better. That is why comb perforated stamps have those lovely neat corners where the holes meet up perfectly.
Harrow perforation
The harrow perforator took things one step further. Instead of punching one line or one row at a time, it perforated the whole sheet in a single go using a grid of pins. This method was slower, but the results were spotless. Every corner matched, every row was even.
Because of that precision, harrow perforation tended to be used for special sheets or limited printings where quality mattered more than speed.
By the 1960s and 1970s, newer machines such as the Huck and Andreotti presses started combining this high quality harrow approach with faster rotary printing, which meant you could finally have both speed and accuracy.
Spotting the difference
Each method leaves its own little signature, which is handy for collectors trying to identify how a stamp was made.
| Method | How it works | Speed or use | What to look for |
|---|---|---|---|
| Line perforation | Punches one line at a time, sheet turned 90° for the next pass | Fast, good for large runs | Corners often overlap slightly or do not meet perfectly |
| Comb perforation | Punches three sides at once, row by row | Medium speed, good quality | Corners align neatly and look very regular |
| Harrow perforation | Whole sheet perforated in one strike | Slower, used for special or high quality sheets | Very even look across the pane, corners meet perfectly |
| Rouletting | Makes cuts or slits instead of holes | Early trials, emergencies or specific issues | Straight or patterned cuts rather than round holes |
| Die cutting | Cuts through self adhesive paper on backing | Modern self adhesive stamps | Wavy or serpentine edges instead of holes |
A quirky modern twist
There is also a fascinating machine nicknamed the Swedish lawnmower. Used on some 1960s British issues, it did not punch straight through the paper like normal perforators. It pressed from the front and sliced from the back, which left slightly larger holes and a fine dusting of paper fibres around the reverse. Collectors sometimes use a magnifier to spot this little detail, which helps identify the exact press used for a particular stamp run.
Other ways stamps were separated
Perforations are not the only story. There are a couple of other ways printers have separated stamps, and they are interesting to recognise in the wild.
What rouletting actually is
Rouletting looks a bit like perforation at first glance, but there is a key difference. With perforations, the machine punches out tiny round pieces of paper and removes them, which leaves holes. With rouletting, the machine makes a series of small slits or cuts between stamps, and no paper is removed. You then tear along the slits.
Rouletting came first in Archer’s early experiments and has popped up in all sorts of places since. Some countries used it for short runs or emergencies, others tried different roulette shapes as a cheaper option. You will see line roulettes with short straight cuts, arcs, zig zags, even little triangles.
Modern die cutting for self adhesives
Most modern stamps use pressure sensitive adhesive, sticker style, so they are cut by a die rather than perforated. The die slices the stamp shape through the stamp layer while leaving the backing paper intact.
The edge often looks wavy or serpentine to mimic the feel of classic perforations. Collectors still measure it with a gauge, but we call it a serpentine die cut measurement rather than a perforation gauge.
A quick guide to roulette styles
Here is a simple lexicon you will run into when identifying older roulettes.
| Variety | French term | What it looks like | Handy example or note |
|---|---|---|---|
| Line roulette | Perce en lignes | Short straight cuts between stamps | Used for speed or economy on some issues, such as Israel 1948 on limited material |
| Pin roulette | Perce en points | Pricked round marks, paper not removed | Looks a bit like tiny holes, still classed as roulette rather than perforation |
| Arc roulette | Perce en arc | Small curved cuts forming gentle arcs | Edges look slightly concave on one side and convex on the other |
| Saw toothed roulette | Perce en scie | Little triangular cuts that look like a saw | Very distinctive jagged look |
| Serpentine roulette | Perce en serpentin | Wavy, flowing cuts | The look many modern die cuts try to imitate |
| Diamond or lozenge | — | Diamond shaped cuts | Rare type, famously seen on Madeira’s first issue in 1868 |
How collectors measure perforations
Measuring perforations might sound like something only die-hard specialists would do, but it is one of the most useful tools in your philatelic kit. The difference of just half a point on a gauge can turn a common stamp into a scarce variety.
The man who set the standard
The idea of actually measuring perforations properly came from a French philatelist, Dr J.A. Legrand, in 1866. He came up with the system we still use today. The “perforation gauge” measures how many holes or teeth fit into a two-centimetre span along the edge of a stamp.
So when you see something described as “Perf 11”, it means 11 holes in 2 cm. Most modern stamps fall somewhere between Perf 11 and Perf 14, but older ones can vary wildly. The coarsest on record is a Perf 2 from Bhopal in 1891, while some Malaysian stamps of the 1950s reached a fine Perf 18.
Compound perforations
Sometimes stamps are not the same all the way round. You might find a stamp that is Perf 12 along the top and Perf 10 down the side. That is what collectors call a compound perforation.
When describing one, the horizontal measurement always comes first, followed by the vertical. So a stamp would be written as “Perf 12 × 10”. This difference can happen for a few reasons, but it is most common on coil or booklet stamps where only two sides needed to be perforated.
A few rare cases exist where even the top and bottom, or the left and right sides, differ. In those cases, measurement and comparison become even more interesting.
Tools of the trade
The classic way to measure a stamp is with a small plastic or cardboard perforation gauge. You line up the holes of the stamp with the printed guide until they match perfectly.
Modern versions, such as Linn’s Multigauge, use clear plastic with continuous markings so you can slide the stamp around to get a fractional reading, which is much more accurate.
For everyday collecting this is plenty, but when you are authenticating valuable material, a normal gauge sometimes is not enough. High-end collectors and experts use specialist tools that mimic the actual perforating pins used by a particular printer. The United States Specialist Gauge, for instance, reproduces the exact hole size and spacing pattern from official printing presses.
That extra precision can reveal if a stamp really came from a certain press or if someone has tried to fake the perforations.
Going digital
Technology has brought new ways to check perforations too. Some collectors now scan their stamps and use software overlays to compare the pattern of holes digitally. This can spot minute irregularities that the eye might miss, especially when checking for alterations or counterfeits.
When perforations go wrong
Because perforation is a mechanical process, it is bound to go wrong sometimes. These mishaps are known as EFOs (errors, freaks and oddities) and they can make stamps either fascinating or frustrating depending on how bad the fault is.
Off-centre perforations
If the sheet was mis-aligned when it went through the machine, the perforations can cut into the printed design. Slight off-centres are common, but heavy ones where the design is clipped can really affect value.
Perfectly centred stamps, where the design sits exactly within the frame of perforations, are scarce and much sought after.
Blind perforations
Occasionally the perforating pin presses into the paper but does not punch all the way through, leaving a small dent instead of a hole. Collectors call these blind perfs. They usually happen when a pin breaks, gets worn or the paper is too thick.
A couple of blind perfs are not disastrous, but they do drop a stamp’s grade a little because they spoil the tidy look.
Imperforate errors
Sometimes whole sections of a sheet miss the perforating stage altogether. Stamps without holes on one or more sides are called imperforate errors. They are very desirable but must usually be collected in pairs or blocks so it is clear they are genuine production mistakes rather than trimmed perforated stamps.
A related type, “imperforate between”, means the perforations are missing between two adjoining stamps but present around the outside of the pair.
Double perforations
If a sheet goes through the machine twice, you end up with double perforations. These are easy to spot as two sets of holes slightly out of line. They are considered curiosities rather than major errors, but they are still fun to find.
Damage after printing
Even after a stamp leaves the printer, its perforations can still take a beating.
Pulled perfs happen when a stamp is torn off a sheet too roughly, leaving a ragged edge. They are classed as damage and reduce the value significantly.
Blunt or short perfs mean the teeth have been bent, broken or just not fully cut. They look stubby compared with the others and also lower the grade.
Because the condition of the perforations is such a big part of a stamp’s overall grade, handling them carefully is vital.
Security and design variations
Perforations have moved beyond being purely functional. In recent decades, they have also become a security feature.
One of the most interesting modern developments is the syncopated or elliptical perforation. Instead of a regular run of small circular holes, these stamps include a few larger oval holes or gaps.
The Netherlands first used this idea in the 1920s to make coil stamps stronger so they would not tear apart too easily. Britain later adapted it as a security measure. Since 1993, definitive Machin stamps have included large elliptical holes to make them harder to forge.
Other countries have used stars or other shaped holes for similar reasons. These small design tweaks mean that even the perforations themselves can help authenticate a genuine issue.
Detecting alterations and fakes
Where there is money involved, there will always be people trying their luck. In philately, that often means reperforation, the act of adding or altering perforations to improve a stamp’s appearance or fake a rare variety.
Why people do it
Before 1930, many British and American sheets had straight edges on some sides. Collectors preferred fully perforated examples, so dishonest sellers started adding fake holes to make those straight-edged stamps look “complete”.
Others reperforate to improve centring by trimming and re-perforating one side, or to imitate a scarcer gauge. A common Perf 11 issue, for example, might be re-perforated to look like a rarer Perf 12 version.
The market rewards perfect centring and full edges, so the temptation to tinker is strong.
How experts spot it
Trained eyes look for a few tell-tale signs. Under magnification, genuine perforations show tiny paper fibres torn by the original separating process. Re-perforated edges tend to look too clean because they were punched after the fact.
Specialist gauges that match the genuine pin shape and spacing are also used. If the hole pattern does not exactly fit the official press layout, it is a big warning sign.
Digital overlay techniques make the process even clearer. Experts scan both the suspect side and a known genuine one, overlay them on screen, and see if the spacing matches. Even a fraction of a millimetre difference gives the game away.
In extreme cases, some fakers trim the edges off perforated stamps completely to pass them off as rare imperforate issues. That is why checking the size of the margins is important when verifying anything that claims to be imperforate.
How perforations affect value
Perforations play a big part in a stamp’s grade and price. Collectors and dealers use a few main criteria to judge them.
Centring is the most obvious one. A perfectly centred stamp, where the design sits squarely within the perforations, is considered “superb” and commands a premium. Even a slight shift can drop it down a grade, while heavy off-centring can halve or quarter the value.
Condition of the teeth comes next. Stamps with pulled, blunt or missing perforations are marked down sharply. For some collectors, even one damaged perf can make the difference between “fine” and “faulty”.
Finally, the gauge itself matters. Sometimes the only way to tell two issues apart is the perforation count. For instance, a stamp with Perf 10 might be worth pennies, while the same design with Perf 11 could be rare and valuable.
So when it comes to valuation, knowing your perforations can make a world of difference.
How to protect your collection
If you collect stamps, especially mint or high-grade ones, the perforations need careful handling. Here are a few simple tips that make a big difference.
- Use stamp tongs, not fingers. Skin oils and small snags can easily damage the teeth.
- Avoid tearing stamps from sheets or booklets. Instead, gently fold along the perforations and separate slowly.
- Store stamps properly in mounts or stock books that do not press against the edges.
- Watch humidity – damp paper softens and tears more easily.
These small habits help keep those delicate perforations neat and clean for years to come.
A collector’s checklist for perforations
For anyone who wants to take perforation study a bit more seriously, here are a few practical steps that make your collecting life easier.
| Task | Why it matters | How to do it |
|---|---|---|
| Learn to recognise machine types | Helps identify the production method and printing era | Look closely at corner alignment — line perfs overlap slightly, comb and harrow meet cleanly |
| Measure every new stamp | Small differences can reveal rare varieties | Use a gauge on both top and side edges |
| Keep notes | You’ll spot trends and mistakes faster | Record gauge readings, press type and country |
| Check alignment under magnification | Helps spot re-perforations or trimmed edges | Look for natural paper fibres along genuine holes |
| Compare with a trusted reference | Confirms identification | Use catalogue images or scans of known genuine examples |
Modern security and the future of perforations
Today’s stamps still use perforations, but often as much for security as for separation.
Countries such as Great Britain, the Netherlands and Macao have added distinctive hole shapes (ovals, stars, syncopated patterns) that help postal authorities tell genuine stamps from counterfeits. Combined with microprinting and invisible inks, they form part of an ongoing cat-and-mouse game between printers and forgers.
Even in the age of self-adhesive stamps, those little teeth or wavy cuts remain an important link between traditional philately and modern printing technology.
Perforations are more than decoration. They tell a story about the technology, economics and craftsmanship behind every stamp. From Henry Archer’s clever invention in the 1840s to today’s precision die-cutting, those small rows of holes mark the line between art and engineering.
Learning to recognise the different types, measure them accurately and spot when something is not quite right gives you a huge advantage as a collector. And once you start looking closely, you realise just how much history can hide along the edge of a stamp.
Here’s where I got a lot of my information from
- The Story Behind Stamp Perforations- Apfelbaum’s Corner
https://www.linns.com/apfelbaums-corner-blog/stamp-perforations-history - Perforations [138] – Éire Philatelic Association
https://eirephilatelicassoc.org/abcs-of-philately/perforations-138/ - Separation: perforations, roulettes, die cuts – Linns Stamp News
https://www.linns.com/news/postal-updates-page/stamp-collecting-basics/2005/april/separation–perforations–roulettes–die-cuts.html - America’s First Perforated Stamps – Mystic Stamp Discovery Center https://info.mysticstamp.com/americas-first-perforated-stamps_tdih/
- Postage stamp separation – Wikipedia
https://en.wikipedia.org/wiki/Postage_stamp_separation - Stamp Perforation
https://www.cmm.gov.mo/eng/exhibition/firstfloor/moreinfo/1_2_4c_StampPerfuration.html - Postage stamp separation – Wikipedia
http://library.snls.org.sz/archive/doc/wikipedia/wikipedia-terodump-0.1/tero-dump/wikipedia/po/Postage_stamp_separation.html - Know your Stamps: A Guide to Understanding Stamp Perforation – The Philatelis https://thephilatelist.org/know-your-stamps-a-guide-to-understanding-stamp-perforation/
- Rouletting – Production of Stamps.cdr
https://pamnani.info/philatelysite/pdf_files/Rouletting-ProductionofStamps.pdf - The Intrigue of Rouletted Stamp Perforations | Mystic Stamp Discovery Center, https://info.mysticstamp.com/learn/the-intrigue-of-rouletted-stamp-perforations/
- Postage stamp – Wikipedia,
https://en.wikipedia.org/wiki/Postage_stamp - December 29, 2013, Perforations on Stamps – is there a difference? | SAFE Collecting Supplies, https://www.safepub.com/perforations-on-stamps/
- A Quick Guide to Perforation Gauges and How to Use Them in Stamp Collecting,
https://info.mysticstamp.com/learn/a-quick-guide-to-perforation-gauges-and-how-to-use-them-in-stamp-collecting/ - 5.0 – Seperation – Perforation – Rajesh Pamnan
http://pamnani.info/philatelysite/pdf_files/6thdefinitive_chapters/5.0seperation-perforation.pdf - How well do you know stamp perforations?
https://www.linns.com/news/postal-updates-page/stamp-collecting-basics/2002/july/how-well-do-you-know-stamp-perforations-.html - A concise guide to postage stamps
https://stamps.postmuseum.li/knowledge - Perplexing Swedish Perforations: Sweden Perforation Types & Formats by Jay Smith & Associates,
https://www.jaysmith.com/Resource/Articles/sweden_perforations.html - Stamp perforations and their types
https://blog.arpinphilately.com/stamp-perforations-and-their-types/ - Line vs Comb Perforations. How to tell the difference. – EzStamp
https://ezstamp.com/line-vs-comb-perforations-tell-difference/ - Measurements of Stamp Separation Features by Digital Image Analysis
https://www.battleship-revenues.com/articles/PerfMeas.html - How to correctly identify perforations – Austrian Philatelic Society
https://austrianphilately.com/postal-history/how-to-correctly-identify-perforations/ - Stamp separation appears in many forms
https://www.linns.com/insights/stamp-separation-appears-in-many-forms-.html - Stamps And Perforation – Les Wilkinson,
https://www.les-wilkinson.co.uk/article12.shtml - Sheets & Perforations – GB Stamp Rolls
https://www.gbstamprolls.com/sheets-perforations/ - Postage Stamp Separation – Mintage World
https://www.mintageworld.com/blog/postage-stamp-separation/ - Perforation gauge – Wikipedia
https://en.wikipedia.org/wiki/Perforation_gauge - Perforation varieties can make the difference – Linns Stamp News
https://www.linns.com/insights/perforation-varieties-can-make-the-difference-.html - GLOSSARY OF PHILATELIC TERMS Abnormal Term used for certain stamps produced by De La Rue for Great Britain 1862-1880 from plates – The Postal Museum
https://www.postalmuseum.org/wp-content/uploads/2016/10/Glossary.pdf - Perforation – Find Your Stamps Value
https://findyourstampsvalue.com/helpful-terms/perforation - Learning the Three R’s Part 3 – Reperforated Stamps
https://www.americanstampdealer.com/SubMenu/Learning_the_Three_R_s_Part_3_Reperforated_Stamps.aspx?id=337 - Reperforation – The Philatelic Foundation
https://www.philatelicfoundation.org/educational-resources/research-articles/reperforation/ - How To Digitally Compare Stamp Perforations – YouTube
https://www.youtube.com/watch?v=W5M4wEWhwVU - Blind Perforations on Postage Stamps | Mystic Stamp Discovery Center
https://info.mysticstamp.com/learn/blind-perforations-on-postage-stamps/ - Perforation Guide – Discworld Stamp Catalogue
https://www.discworldstampcatalogue.co.uk/shsperforations.php - Errors, freaks, and oddities – Wikipedia
https://en.wikipedia.org/wiki/Errors,_freaks,_and_oddities - https://www.warwickandwarwick.com/news/guides/philatelic-terms#:~:text=Blunt%20perforation%20(Blunt%20perf)%3A,than%20would%20usually%20be%20expected
- Philatelic terms explained: A guide to stamp collecting abbreviations https://www.warwickandwarwick.com/news/guides/philatelic-terms
- Counterfeit and Reused Postage Stamp Manual – Universal Postal Union https://www.upu.int/UPU/media/upu/files/postalSolutions/programmesAndServices/postalSupplyChain/Security/Counterfeit%20and%20Reused%20Postage%20Stamp%20Manual/En_POC-C-1-2024-2%E2%80%93Doc-6-Annex-2.pdf
- Syncopated perfs – Stamp Encyclopedia
https://stampencyclopedia.miraheze.org/wiki/Syncopated_perfs - The Machin stamps of Great Britain 1967 – 2022
https://stampssa.africa/wp-content/uploads/2023/07/The-Machin-stamps-of-Great-Britain-1967-2022.pdf - Machin stamps produced in different formats over a half century
https://www.linns.com/news/us-stamps-postal-history/machin-stamps-produced-in-different-formats-over-half-century.html - How To Value A Stamp Collection- https://startstampcollecting.com/how-to-value-stamp/
- Is My Stamp Re-Perforated? – Brixton Chrome
https://brixtonchrome.com/pages/is-my-stamp-re-perforated - ahttps://www.americanstampdealer.com/SubMenu/Learning_the_Three_R_s_Part_3_Reperforated_Stamps.aspx?id=337#:~:text=The%20even%20nature%20of%20the,more%20expensive%20fully%20perforated%20version.
- Reperforations : r/philately – Reddithttps://www.reddit.com/r/philately/comments/1ns4awn/reperforations/
- A survey of counterfeits, forgeries and other questionable stamps – Linns Stamp News, https://www.linns.com/news/us-stamps-postal-history/a-survey-of-counterfeits–forgeries-and-other-questionable-stamp.html
