Most counterfeit postage fails two physical tests, and both can be done at a desk in under a minute. One needs nothing but a fingertip. The other needs a jeweler's loupe that costs less than a roll of stamps.
Here is what to look for, and why these particular details are so hard to fake.
Test one: texture
Run a fingernail lightly across the surface of the design.
Genuine intaglio-printed stamps have relief. The ink sits on the paper in a raised layer rather than soaking into it, and you can feel the ridges — subtle, but unmistakable once you have felt a real one.
Counterfeits are almost always flat. They come off offset presses, photogravure imitation, or consumer-grade digital printers, none of which produce relief. The surface feels like a printed page, because that is what it is.
The paper itself gives you a second signal. Genuine stamp paper has a specific crispness. Stock that feels grainy, soft or oddly slick is worth a closer look.
Test two: microprinting under 10x
This is the definitive one.
USPS embeds microprinting in stamp designs — tiny letters, often only a fraction of a millimeter tall, positioned within the artwork. Under a 10x jeweler's loupe on a genuine stamp, those letters are sharp and legible. You can read them.
On a counterfeit, the same area resolves into a blur of halftone dots. It is not that the letters are wrong — it is that there are no letters, only an approximation of where letters were in the image that got copied.
This is difficult to defeat because it requires the original printing process rather than a good scan. A photograph of microprinting reproduces as dots at any resolution a counterfeiter can afford.
Why the design makes both tests reliable
Intaglio engraving and microprinting are security features, not aesthetic ones. Both were chosen precisely because reproducing them requires the equipment and the plates, not just the image.
A counterfeiter working from a scan can match color reasonably well and size approximately. They cannot produce relief without an intaglio press, and they cannot produce legible microprinting from a copy of a printed stamp.
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The test you cannot do at home
Worth knowing about, because it is the one that actually stops mail.
Genuine stamps carry phosphor tagging that fluoresces at a specific frequency under UV light. Automated sorting equipment reads it on every piece passing through a processing center. Untagged stock does not slow down — it comes out of the stream.
You cannot verify phosphor response with a loupe, which is why the physical checks above are a supplement to careful sourcing rather than a replacement for it.
Three more checks worth thirty seconds
- Perforations. Genuine holes are round, clean, evenly spaced and consistent on all four sides. Triangular, slot-shaped or ragged holes indicate a manual or low-grade perforator.
- Adhesion. Federal self-adhesive stock uses a permanent pressure-sensitive bond. It should not lift at a corner, and it should not peel in damp conditions.
- Batch consistency. Pull five at random. Color, size and perforation should be identical across all five. Variation means stock has been mixed from different sources.
What the comparison looks like
| Verification point | Genuine stock | Counterfeit |
|---|---|---|
| Microprinting at 10x | Sharp, legible letters | Blurred halftone dots |
| Surface texture | Raised intaglio relief | Flat, no relief |
| UV tagging | Correct phosphor response | Inert |
| Audit trail | Commercial invoice | None, or personal payment only |
The check that comes before all of these
Physical inspection catches bad stock after you have paid for it. Sourcing catches it before.
Authentic postage bought on the secondary market — overstock, liquidations, unused event inventory — supports a discount around 10–20%. When a "liquidator" quotes 40%, the number itself is the finding. No inspection required.
Beyond the discount, ask for the invoice. A legitimate seller is a business with a verifiable US commercial address and a tax ID. A seller who wants payment through a personal transfer app is not one.
Useful references
For rate changes that affect what you should be paying, the Postal Regulatory Commission and the USPS Notice 123 charts. For service disruptions, USPS service alerts. For the urgent local question, the USPS location finder.
Buy at full price from the USPS official store, or in bulk at a defensible discount from a specialist such as Forever Stamp Center.
The short version
Feel for relief. Look for legible microprinting at 10x. Check that five random samples match each other. And treat any discount past 20% as the answer rather than the offer.
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USPS professional based in New York with over 12 years of experience in postal operations. She writes about Forever Stamps, offering practical guidance on safe purchasing and mailing practices while closely following USPS policy updates.
