How to Authenticate an Hermès Birkin & Kelly: Blind Stamps, Heat Stamps, Hardware & Stitching (2026 Guide)

To authenticate an Hermès Birkin or Kelly, verify five things together: the blind stamp (its letter and shape must match the bag’s era), the heat stamp beneath the flap, the hand saddle-stitching, the engraved hardware with a padlock number that matches its keys, and the leather and construction. No single mark is proof — replicas now copy stamps and craftsman codes — so a bag must pass all five. Every piece in our authenticated pre-owned Hermès edit does, before it is listed.

Why Hermès authentication is the highest-stakes check in luxury

Hermès authentication carries the highest stakes in luxury because the bags are expensive at retail, hold their value better than almost anything else on the secondary market, and are among the most heavily targeted by counterfeiters. A mistake here is a five-figure mistake.

What a Birkin or Kelly costs in 2026

In January 2026 a Birkin 25 in Togo retails at $13,500 in the US, and a Kelly 25 at $13,700. Larger sizes cost more, and these are boutique prices, before any resale premium.

Why counterfeiters target Hermès

Resale value is the incentive. A 2025 industry resale report found that Hermès bags averaged 138% of retail on the secondhand market, up 38 points on the year before. The Kelly Mini II reached 282% and the Sellier Birkin 183%. Over the past decade, Birkin resale prices rose about 92% while Hermès retail rose 43%.

When a pre-owned bag can sell above its boutique price, a convincing replica becomes highly profitable. That profit funds better counterfeits.

Why checking the stamp is no longer enough

The blind stamp was once the quick test. High-end replicas now reproduce date letters in the correct shape for the claimed year, and some copy the craftsman codes that have appeared beside the stamp since 2016. A correct-looking stamp shows that a counterfeiter did their research. It does not prove the bag is real.

What a specialist inspection involves

Our specialists treat every mark as one piece of evidence that must agree with all the others. A bag passes only when all five checks align:

• The blind stamp's letter and shape match the era of the leather, hardware and style.
• The heat stamp is crisp and correctly accented, and its foil colour matches the hardware.
• The hand saddle-stitching sits at a slight, consistent slant.
• The hardware is heavy and engraved HERMÈS, and the padlock number matches its keys.
• The leather, edge construction, handle count and strap are correct for the model.

That cross-check is the basis of our Authenticity Guarantee. It is also the standard the rest of this guide teaches you to apply.

The Hermès blind stamp decoded: dating a bag by its letter

The blind stamp is a small letter pressed into the leather that tells you the year a Hermès bag was made, and the shape around that letter tells you the era before you even read it. It dates a bag; it does not authenticate one. A replica can carry a perfect-looking stamp, so the letter is only useful when everything else about the bag agrees with it.

The four letter cycles since 1945

Hermès has stamped its bags since 1945, cycling through the alphabet and changing the frame around the letter each time a cycle closes. There are four cycles, and the first three run in strict alphabetical order.

• 1945–1970: plain letters, A to Z in order.
• 1971–1996: letters inside a circle, A to Z in order.
• 1997–2014: letters inside a square, A to R in order.
• 2015 onward: plain letters again, no longer alphabetical.

The post-2015 letters

From 2015 Hermès returned to unframed letters and stopped following the alphabet, so each year has to be learned individually. The sequence so far:

Because plain letters appear in both the first and fourth cycles, a plain A can mean 1945 or 2017. The bag's style, hardware and stamp location settle which one it is.

Where the stamp sits on a Birkin or Kelly

On bags made since 2016, the stamp sits on the interior, on the left side, near the back. On earlier Birkins and Kellys, look under the front tab (the sangle) and on the underside of the strap. Our specialists use a raking light at a low angle to read it, because the stamp is uncoloured and can be faint on grained leathers such as Togo or Clémence.

Location is itself a dating signal. A stamp letter claiming a recent year that turns up under the strap, or a square-era letter sitting inside on the left near the back, is a contradiction that needs explaining.

The craftsman stamp since 2016

Since 2016, the blind stamp on Birkins and Kellys is typically a row rather than a single letter. It shows the date letter plus a combination of letters and numbers, with two letters beneath. Those two letters are the craftsman's personal stamp.

Every certified Hermès artisan has a unique stamp, and a Birkin or Kelly is traditionally made by one craftsman from start to finish. Replicas now copy this format too, so we read the row for layout, spacing and depth, not just presence.

Pressed, never printed

A genuine blind stamp is pressed into the leather with a heated tool, not printed, inked or painted on the surface. Run a fingertip over it and you feel a crisp, clean impression with even depth across every character.

Where a circle or square frames the letter, the letter should sit centred and level inside it. Shallow, blurred, uneven or tilted characters, or any trace of pigment, are reasons for closer inspection.

Why the stamp must agree with the rest of the bag

The stamp is a claim about the year, and every other detail has to support that claim. The leather, colour, hardware finish and construction details should all be consistent with the era the letter indicates.

Counterfeiters often fix the stamp and miss the context: a correct-looking letter on a bag whose stamp placement, leather or hardware belongs to a different decade. When we assess any piece in our Hermès handbags edit, the date stamp is the starting point of the inspection, not the conclusion.

The heat stamp: HERMÈS PARIS MADE IN FRANCE

The heat stamp is the foil-pressed brand mark on the front of every Birkin and Kelly, just beneath the flap. It must read HERMÈS PARIS / MADE IN FRANCE, sit centred and level, and use a foil colour that matches the hardware. Our specialists check it immediately after the blind stamp because replicas often copy the wording correctly but miss the precision.

Where the heat stamp sits

Lift the flap and look at the front panel of the body, directly below where the flap rests. The wording runs in stacked, centred lines, with HERMÈS on top and MADE IN FRANCE beneath. A stamp that drifts toward one side, tilts against the bag's edges or sits noticeably high or low deserves a closer look.

Foil colour must match the hardware

Gold hardware takes a gold-foil stamp. Palladium hardware takes a silver-foil stamp. This is one of the fastest checks available, and a mismatch, such as gold foil on a palladium bag, is a serious warning sign.

Foil softens and wears with years of handling, so an older bag may show a faded stamp. That wear should match the rest of the bag's condition. A pristine stamp on a heavily used bag, or a worn stamp on an otherwise unused one, does not make sense.

Letterform, depth and the accent

A genuine heat stamp is crisp. The letters have clean edges, consistent spacing and an even impression from the first character to the last, with no part pressed deeper than the rest. The foil stays inside the impression rather than bleeding onto the surrounding leather.

The È in HERMÈS carries a grave accent, sloping down from left to right. It should be small, cleanly formed and positioned directly above the E. Our specialists read the accent with a loupe, because it is one of the details counterfeiters get wrong most often.

Common replica tells

• A missing accent, an acute accent sloping the wrong way, or an accent that is oversized or misplaced
• Letters that are too thick, too tall or unevenly spaced, or a font that looks slightly off
• Blurred edges, foil spilling beyond the letters, or patchy coverage on a bag with little wear
• Uneven depth, with some letters pressed hard and others barely registering
• Foil colour that does not match the hardware
• A stamp that is off-centre or crooked against the panel

A correct heat stamp does not prove a bag is genuine, because skilled replicas can reproduce one. A wrong one, however, is usually enough reason to walk away.

Saddle stitching: the slant replicas get wrong

Genuine Hermès stitching is done by hand with a saddle stitch in waxed linen thread, so each stitch sits at a slight, consistent slant and looks subtly individual rather than machine-perfect. Replicas most often fail here, because true saddle stitching is slow, and slow work is expensive.

How the Hermès saddle stitch is made

A saddle stitch uses a single length of thread with a needle at each end, passed through the same hole from opposite sides. Each stitch is locked independently, so a broken stitch does not unravel the seam the way a machine lockstitch can. The thread is linen, waxed for strength and water resistance, and it sits slightly raised and rounded on the leather.

The slant: what to look for

Run your eye along a straight seam, such as the flap edge or the side gussets. Each stitch should angle at the same slight diagonal, evenly spaced, with tiny variations in tension that betray a human hand. Our specialists look for consistency of angle, not robotic uniformity.

Corners, handles and edges

Stress points tell you the most. Corners are hand-finished, with stitches that turn cleanly and stay evenly spaced through the curve. The rolled handles of a Birkin and the single handle of a Kelly should show tight, even stitching where they meet the body, with no puckering. Edges are smoothly finished and painted, never raw, frayed or rubbery.

Thread colour conventions

Hermès commonly uses either tonal thread that matches the leather or a contrasting thread, often white or cream, that outlines the bag's architecture. Whichever is used, the colour is applied consistently across the whole bag. A mix of shades between panels, or thread that looks glossy and synthetic, warrants a closer look.

Replica tells

• Machine-straight stitching: stitches that lie flat, dead straight and identical in length across every seam.
• Synthetic thread: a shiny, plastic sheen instead of the matte, waxed finish of linen.
• Glue traces: residue along seams or edges, or panels held by adhesive where stitching should do the work.
• Uneven corners: bunched, skipped or crowded stitches where the seam turns.

Some high-grade replicas are now partly hand-stitched, so a correct slant supports authenticity but never proves it alone. Stitching also shows age. Loose or rubbed threads at the handles are normal wear on a genuine bag and are graded in our Condition Guide, not treated as a warning sign.

Hardware: touret, padlock, keys and clochette

Genuine Birkin and Kelly hardware is solid metal plated in gold or palladium, and it feels noticeably heavy in the hand. Every key component should be engraved HERMÈS, the padlock number must match the keys, and every piece of metal on the bag should share one consistent finish.

Weight and material

Hermès hardware is plated solid metal, not hollow castings or coated alloy. Our specialists handle the padlock first because weight is immediate and hard to fake: a genuine lock has a dense, substantial feel, and the touret plate does not flex under pressure. Replica hardware is often light, sounds tinny when tapped, and may show painted or flaking colour at edges and high-contact points.

The touret and sangles

The touret is the turn-lock that secures the two sangles (the leather straps) across the front of both models. On a genuine bag it rotates smoothly with firm, precise resistance, and the HERMÈS engraving on the plate is clean, evenly deep and correctly accented. Shallow, fuzzy or uneven engraving, a gritty turning action, or a plate that sits loose against the leather all warrant closer inspection.

Padlock and keys

The padlock is engraved HERMÈS and carries a number, and each key is stamped with that same number. A mismatch does not always mean the bag is counterfeit, because locks and keys are sometimes swapped between bags over decades of ownership. It does mean the set is incomplete and the provenance needs explaining. A blank padlock, a number that is printed rather than struck, or keys that fail to open the lock are serious tells.

The clochette

The clochette is the leather bell that holds the keys and hangs from a handle. It should be made from the same leather as the bag, cut cleanly, with hand-finished edges and stitching that matches the rest of the piece. Our specialists check that the snap or opening closes neatly and that the keys sit inside without forcing.

Feet and interior zip

The base of a Birkin or Kelly carries metal feet that protect the leather when the bag is set down. They should match the plating of the lock and touret exactly and be firmly seated, with no glue residue around them. The interior zip pocket follows the same rule: its hardware should run smoothly and share the bag’s finish.

Plating consistency

Every metal element, from touret, padlock and keys to feet and zip, should share one finish and one tone. A gold lock beside slightly brassy feet, or palladium that looks greyish next to bright touret plating, suggests replacement parts or a replica. The finish must also agree with the heat stamp: gold foil with gold hardware, silver foil with palladium.

• Genuine: heavy, crisply engraved, numbers matching, uniform plating.
• Replica tells: light weight, painted or brassy colour, shallow engraving, blank or mismatched numbers.

Leather, construction and silhouette: Togo, Epsom, Retourné, Sellier

Leather, edge construction and silhouette must all agree with the model being sold. A genuine Birkin or Kelly is made in a recognised Hermès leather, built in the construction correct for that model, and carries the right handle and strap configuration. Replicas often get one of these right and another wrong.

How the core leathers look and behave

Each Hermès leather has a distinct grain and a predictable way of ageing. Our specialists compare what they see and feel against what the stated leather should do.

• Togo: a raised, natural grain that varies across the panel. It is structured and keeps its shape well.
• Clémence: a heavier, flatter grain. It is weightier and slouchier than Togo, so a Clémence bag relaxes over time.
• Epsom: an embossed, regular grain. It is rigid and light, and it holds the crisp lines of a Sellier construction.
• Swift: smooth, with almost no visible grain. It takes colour with unusual saturation and has a soft hand.

Natural grain varies slightly from one part of a hide to another. A grain that repeats too evenly, or looks printed onto the surface, is a replica tell. So is a stiff, plastic hand-feel.

Retourné vs Sellier edges

Retourné means the bag is stitched inside-out and turned, which gives rounded edges and a softer outline. Sellier means the stitching sits on the exterior, over a more rigid frame with sharp, defined corners. The edges must be consistent all the way around. A bag that mixes soft and sharp edges, or claims one construction while showing the other, fails.

Silhouette: handles, strap and sizes

A Birkin has two rolled handles and no shoulder strap. A Kelly has a single top handle and a detachable shoulder strap. A "Birkin" sold with a strap is not a Birkin.

Both models close with a touret, sangles and a clochette. Browse our authenticated Birkin and Kelly edits to see each construction in person-scale photography.

Why a Sellier Birkin needs extra scrutiny

Standard Birkins are Retourné, and a Sellier Birkin is rare. Rarity drives value: the Clair report's 2025 Clair report put Sellier Birkin price retention at 183% of retail. That premium makes it an attractive target for counterfeiters. When a Sellier Birkin appears, our specialists hold every other check (stamp, stitching, hardware and leather) to an even stricter standard.

Smell and hand-feel

Genuine Hermès leather smells of leather, never of chemicals or solvent. In the hand, the panels feel substantial and supple, appropriate to the stated leather. A sharp chemical odour or a plasticky surface is reason to stop the inspection there.

Real vs replica: side-by-side comparison

A genuine Birkin or Kelly differs from a replica in seven details: blind stamp, heat stamp, stitching, hardware, construction, leather and silhouette. A real bag passes every one. A replica usually fails at least one, and often several.

How to read the comparison

The table below lists the differences our specialists check first, in roughly the order they examine a bag. Each row pairs what genuine Hermès looks like with the replica tell we see most often.

Use it as a cross-check, not a scorecard. A correct blind stamp means little if the padlock number does not match the keys, and a convincing heat stamp cannot rescue machine-straight stitching. Every detail must agree with the others and with the era the stamp claims.

Why no single row is enough

Better replicas now copy individual marks, including date letters and craftsman codes, so any one detail can be faked on its own. What they rarely achieve is consistency across all seven. That means the right leather for the year, the right edge construction for the model, foil that matches the hardware, and hand stitching with a slight, even slant. That agreement is what authentication actually tests.

Red flags: when to walk away

Walk away the moment a single core check fails. Genuine Hermès is consistent across every detail, so one contradiction, such as a stamp that does not fit the year or a lock that does not fit its keys, outweighs any number of details that look right.

Why one red flag is enough

Replicas are built to pass a quick look, not a full inspection. Makers copy the features buyers check most often, so a convincing heat stamp or a plausible date letter means little on its own. The tell is usually where two details must agree and do not.

Our specialists treat the list below as disqualifying rather than as a score. A bag either clears every point or it is not listed.

When the seller is the red flag

Hesitation counts as evidence. A seller who cannot photograph the blind stamp, padlock and keys up close, or who points to a receipt, box or dust bag instead, is asking you to trust packaging over the bag itself. Packaging is the easiest part to reproduce.

Buying a pre-owned Birkin or Kelly with confidence

Buy a pre-owned Birkin or Kelly only after a specialist has checked all five markers together: blind stamp, heat stamp, stitching, hardware, and leather and construction. At $13,500 to $15,400 retail and an average resale of 138% of retail, a single overlooked detail is a five-figure mistake.

Why multi-point, in-house authentication is non-negotiable

Replicas now copy date letters and even craftsman codes, so a correct stamp proves nothing on its own. A genuine bag is consistent across every marker. The blind-stamp era agrees with the leather, the heat-stamp foil matches the hardware, the padlock number matches the keys, and the construction is right for the model.

Our specialists examine each piece in hand, in-house, before it is listed. That process is the basis of our Authenticity Guarantee.

What to ask a seller before you commit

Any seller of a genuine bag can supply clear close-ups on request. Ask for:

• The blind stamp, photographed straight on in raking light so the pressed depth is visible, plus the craftsman code on bags made since 2016.
• The heat stamp beneath the flap, sharp enough to read the accent on HERMÈS.
• The padlock and both keys side by side, with the numbers legible.
• The touret, sangles and clochette, and a macro shot of the saddle stitching at a corner.
• Full exterior views of all four corners and the base, which show wear honestly.

Hesitation over any of these is a red flag in itself.

Why a receipt is not proof

A receipt documents a transaction, not the object in front of you. Receipts can be forged, and genuine ones can be paired with a replica. Treat paperwork as supporting context only. Authenticity is settled by the bag itself.

Where to start

Browse our authenticated Birkin and Kelly collections, or the wider edit of Hermès handbags, including the Constance, Evelyne, Picotin and Lindy. Each listing states its date stamp, leather and hardware, and every condition grade is defined in our Condition Guide. Recently authenticated pieces appear first in new arrivals.

Hermes Shoulder Bag Evelyne 2 GM Taurillon Clemence Black Silver$3,910

Hermes Evelyne TPM Etoupe Silver Taurillon Clemence Leather Shoulder Bag$5,190

Hermes Lindy 26 Shoulder Bag$6,785

Hermes Handbag Birkin 25 Swift Silver$32,080

Shop all authenticated Hermès handbags

Frequently asked questions

What does the Hermès blind stamp chart look like?

Hermès blind stamps run in four cycles. From 1945 to 1970 the date letter is plain. From 1971 to 1996 it sits inside a circle, and from 1997 to 2014 inside a square. From 2015 letters are plain again and no longer alphabetical: 2015 is T, 2016 X, 2017 A, 2018 C, 2019 D, 2020 Y, 2021 Z, 2022 U, 2023 B and 2024 W. Read the shape first to fix the era, then read the letter.

Where is the stamp on a Birkin?

On Birkins made since 2016, the blind stamp sits inside the bag on the left side, near the back. On earlier Birkins and Kellys, look under the front tab (sangle) and on the underside of the strap. Because the stamp is pressed into the leather rather than printed, it can be faint. Tilt the bag under a single light source at a low angle, which makes the impression easier to read and shows whether it is genuinely debossed.

What is the Hermès date code letter for 2024?

The 2024 Hermès date letter is W, stamped as a plain letter with no circle or square around it. Since 2015 the letters no longer follow the alphabet, so neighbouring years are easy to confuse: 2022 is U, 2023 is B and 2024 is W. On a 2024 Birkin or Kelly, the W appears inside on the left near the back, as part of a row that includes the craftsman's code. A W inside a circle or square points to a different era entirely.

How can you tell a fake Birkin?

Check five things together. The blind stamp must be pressed, not printed, with a letter and shape matching the bag's era. The heat stamp beneath the flap must read HERMÈS PARIS MADE IN FRANCE in foil matching the hardware. Stitching should be hand saddle-stitched at a slight, consistent slant. Hardware should be heavy, engraved HERMÈS, with a padlock number matching the keys. Finally, a Birkin has two handles and no shoulder strap. Failing any single check is reason to walk away.

Does Hermès authenticate bags?

No. Hermès does not offer an authentication service for bags bought on the secondary market, and boutique staff will not certify a pre-owned piece. That leaves buyers relying on specialist authenticators who examine the blind stamp, heat stamp, stitching, hardware, leather and construction together rather than any single mark. At The Collector Edit, our in-house specialists inspect every Hermès bag against these points before it is listed, and each piece is covered by our Authenticity Guarantee.

What does the Hermès craftsman stamp mean?

The craftsman stamp identifies the individual artisan who made the bag, and every certified Hermès artisan has a unique personal stamp. Since 2016, Birkins and Kellys typically carry a row combining the date letter with letters and numbers, with two letters beneath that form the craftsman's mark. It confirms the bag's maker on paper, but replicas now reproduce craftsman codes convincingly, so the stamp only counts when the stitching, hardware, leather and construction all agree with it.

Is the Birkin heat stamp gold or silver?

It depends on the hardware. The heat stamp beneath the flap on the front of the bag is foiled to match the metal: gold foil on bags with gold hardware, silver foil on bags with palladium hardware. A gold heat stamp paired with palladium hardware, or the reverse, is a strong replica tell. The lettering, HERMÈS PARIS over MADE IN FRANCE, should also be crisp, evenly pressed and correctly accented on the È.

Should the Hermès padlock number match the keys?

Yes. On a genuine Birkin or Kelly, the number stamped on the padlock matches the number on its keys, and both the padlock and the touret turn-lock are engraved HERMÈS. The keys are carried in the leather clochette that hangs from the handle. A padlock number that does not match the keys is one of the clearest red flags, and our specialists treat it as reason to walk away rather than a detail to explain.

What leather is my Birkin made of?

Most Birkins come in one of four leathers. Togo has a visible natural grain and a structured but relaxed shape. Clémence has a heavier, flatter grain and slouches more with wear. Epsom is embossed with a fine, regular pattern and is rigid, holding sharp edges well. Swift is smooth with a soft sheen and especially saturated colour. Genuine grain looks varied and organic; a printed, repetitive pattern or plastic feel suggests a replica.

Is it safe to buy a Birkin resale?

Yes, when the bag has passed multi-point authentication by specialists. Hermès holds value exceptionally well, averaging 138% of retail on the secondary market in a 2025 industry report, which is exactly why replicas target it. Before buying, ask for close-up photos of the blind stamp, heat stamp, padlock and keys. Do not treat a receipt as proof, because receipts can be forged and are not tied to a specific bag. Buy from a seller that authenticates in-house and guarantees it.