Hermès does not issue certificates of authenticity. It never has. The bag itself is the certificate — provided you know how to read it. This guide sets out the method our team applies to every Kelly, Birkin and Constance that enters CollectorElysium, from the first touch of the leather to the last digit on the lock.
Start with the object, not the paperwork
The most common mistake is to begin with the receipt, the box and the dust bag. All three are traded separately, all three are reproduced, and none of them says anything about the bag in front of you. Genuine Hermès packaging accompanying a counterfeit is a classic configuration. So we set the accessories aside and start where the house's craftsmanship cannot be imitated cheaply: the leather, the stitching, the hardware and the stamps.
A second principle: no single sign is conclusive. A convincing counterfeit will pass two or three of the checks below. It almost never passes all of them at once. Authentication is a convergence of details, not a checklist with a magic box.
1. The leather and its hand
Hermès leathers are chosen for a specific behaviour, and a trained hand recognises them before the eye does. Togo is a grained calfskin with a soft, matte, slightly springy surface; the grain is irregular, never printed in a repeating pattern. Epsom is embossed, firm and lightweight, with a fine, crisp grain that holds its shape and shows a subtle sheen. Box calf is smooth, dense and glossy, and it develops a patina and fine scratches with age that counterfeiters rarely reproduce convincingly. Clémence is heavier and slouchier than Togo, with a larger, flatter grain. Swift is smooth with a very fine grain and takes colour with unusual saturation.
What we look for: a grain that varies across the panels (natural hides are not uniform), a smell of leather and tannin rather than glue or plastic, and a cut edge finished with layers of tinted lacquer that are smooth and even, not thick, bubbled or cracked. On exotic skins — Porosus crocodile, Niloticus, alligator, ostrich, lizard — the scales must be irregular and symmetrical only where the artisan intentionally centred them; a CITES-marked skin will also carry the house's symbol next to the stamp (a ^ for Porosus, a square for Niloticus, two dots for alligator).
2. The stitching: the saddle stitch
Every Hermès bag is sewn by hand with the saddle stitch: two needles, one waxed linen thread, passing through the same hole from opposite sides. The result has a signature that a sewing machine cannot produce. The stitches sit at a slight, consistent angle rather than perfectly straight; they are not mathematically identical in length but they are perfectly regular in rhythm; the thread is tight and slightly recessed into the leather, never sitting on top of it; and if one stitch were cut, the seam would not unravel.
Machine stitching, which counterfeiters use for speed, is dead straight, perfectly uniform, and often looser. On a genuine piece, the thread colour is matched to the leather with intent — the famous white thread on a Kelly in black box, for instance, is a design choice, not an anomaly. Look closely at the handles and the sangles (the straps that cross the front): these are the most stitch-intensive areas and the first place a counterfeit shows its hand.
3. The hardware
Hermès hardware is solid brass plated in gold, palladium, ruthenium or rose gold, and it is heavy. Pick up the lock: it should have real weight in the hand. The plating is thick and even, with no bubbling, and it wears gracefully at the edges rather than flaking. The turnlock (the touret) turns with a smooth, dense resistance and closes with a precise, muted click; a loose, rattling or gritty mechanism is disqualifying.
Engravings are crisp, shallow and perfectly aligned. On the plate under the touret you will find "HERMÈS PARIS" with the accent on the È; the font is the house's own and does not vary. The lock and the keys carry the same number, engraved on the base of the padlock and on the keys themselves. Hermès uses a limited set of lock numbers, and a number that does not belong to that set is a warning. The clochette — the small leather bell that hides the keys — is cut from the same leather as the bag and stitched, never glued.
The feet under the bag are the same metal and finish as the rest of the hardware, engraved lightly with the house name. Zippers, when present, are made for Hermès: the pull sits flat and parallel to the zip when released, the H on the pull is clean, and the mechanism glides. A zipper that stands up at an angle, or that carries a generic brand, is not Hermès.
4. The heat stamp
Inside the bag, on the front panel below the flap on a Kelly or a Birkin, the house stamps "HERMÈS / PARIS / MADE IN FRANCE" directly into the leather. The three lines are centred, the letters are narrow, clean and evenly pressed; on gold-hardware bags the stamp is usually gold-foiled, on palladium bags it is silver or blind. The impression should be legible but shallow, with no bleeding of the foil and no smudged edges. Counterfeits frequently get the depth wrong — too deep, as if branded — or the spacing, or the accent.
5. The blind stamp: reading the date
Every bag carries a small blind stamp — a letter, sometimes framed — that identifies its year of production, together with codes identifying the artisan and the workshop. Between 1971 and 1996 the year letter sat inside a circle; from 1997 to 2014 inside a square; since 2015 the letter stands alone. So a Kelly stamped with a square F was made in 2002; a Birkin with an unframed D was made in 2019; a bag with a circle Z dates from 1996. The location of the stamp has also changed: on older pieces it sits on the underside of the strap or on the interior of a panel; on recent pieces it is inside the bag, typically on the left-hand side of the interior wall.
The year must be consistent with everything else. A stamp indicating 2019 on a bag whose leather, thread and hardware style belong to the 1990s is a contradiction. A stamp indicating 1996 on a bag with the modern interior placement is another. And a bag that has no blind stamp at all, or whose stamp is illegible by design, should be treated with the greatest caution.
6. The lining and the interior
The interior is finished to the same standard as the exterior. Linings are leather — chèvre (goatskin) on most Kelly and Birkin — with the same colour logic and the same edge finishing as the outside; fabric linings on these models are a red flag. Pockets are cut cleanly; the zipped pocket on the back wall runs the full width; stitching inside is as regular as outside. Counterfeiters spend their effort on what is visible, and the interior is where the effort runs out.
7. Proportions and construction
Each size of each model has fixed dimensions, and they are respected to the millimetre. A Kelly 28 measures 28 cm across the base; a Birkin 30, 30 cm. The bag stands on its own when empty, with the front panel straight and the handles upright on a Birkin, or the single handle centred on a Kelly. The flap on a Kelly is cut so that its edges align exactly with the body when closed. Sellier construction shows its stitching on the outside with crisp, angular edges; Retourné is sewn inside out for a softer, rounded silhouette — and neither should ever be a hybrid of the two.
What the accessories can and cannot tell you
Once the bag itself is beyond doubt, the accessories become useful as a coherence check rather than as proof. The dust bag has evolved over the decades: beige velour with a brown circle on older pieces, then the orange cotton with a brown herringbone band on recent ones, always with the correct typography. The box is orange with a brown edge, the lid fits with precision, and the model and colour reference on the label should match the bag. A receipt should show a boutique, a date consistent with the blind stamp, and a price consistent with the model. And, once more: Hermès does not supply "authenticity cards". A plastic card announcing that the bag is authentic is, on its own, evidence that it is not.
Why we still say no to bags that pass
Authentication and condition are two different questions. A genuine Kelly with a replated touret, a re-dyed panel or a replaced handle is still a genuine Kelly — but it is not an investment-grade piece, and it is not sold as one. Our review notes any restoration, any replacement of hardware, and any repair that departs from the original, because these are what the market prices. Read more on our approach to condition in The Kelly: A Legacy Beyond Fashion and in the guide to Hermès leathers.
How authentication works at CollectorElysium
No piece is listed on the marketplace without passing this review. For our own inventory, it happens when we buy. For pieces submitted by collectors, it happens between submission and publication: photographs first, then the bag in hand at our Paris showroom or via insured shipment, with every point above checked and documented. If we have a doubt, we ask for more; if the doubt remains, the piece is declined. It is slower than a click. It is also the reason a buyer on CollectorElysium never has to ask the question this article answers.
Thinking of selling a Hermès piece? See how consignment works. Looking for one? Browse the authenticated selection, or write to the concierge for a private search.
