Authentication comes down to a small set of details that are expensive to fake well: the blind stamp, the engravings on the hardware, the stitch pattern, the edge paint, and the way the leather behaves. Any single one of those can be copied. What makes a bag read as genuine is three or four of them agreeing at once, plus a hands-on look at the weight and the smell. Photos alone, and paperwork alone, are the two weakest forms of proof.
Start with the blind stamp
The blind stamp is the small heat-pressed mark inside the bag, usually on the back of the flap or on a leather tab near the interior seam depending on the model. On a real bag it is crisp and shallow, with clean letterforms and even spacing. The stamp carries a symbol, a letter, and a craftsman number, and those elements should relate to each other and to the bag's era. I look at the impression itself first. Fakes tend to be too deep, too faint, or slightly blurred at the edges, and the font is often a hair too wide or too narrow compared with the hardware lettering on the same bag.
Compare the blind stamp lettering to the engraving on the turnlock. Both come from the same house, so the letterforms should look like relatives, not strangers.
Hardware engravings and the lock
On a Birkin or Kelly, look closely at the plate on the turnlock and at the base of the sangle hardware. The engraving should be sharp and cut, not lasered into a soft surface. On a counterfeit, the letters often look shallow, and the accent over the E is either missing, oversized, or sitting at the wrong angle.
- Lock and keys should be numbered, and the numbers should match each other.
- Zipper pulls should carry a maker's mark. A pull with no mark at all is worth questioning.
- The metal should feel solid in the hand. Plated pot metal feels light and slightly warm in a way that solid brass does not.
- Screws, where visible, should sit flush and turn cleanly.
Stitching and edge paint
Hermès bags are saddle stitched by hand. Two needles cross through the same hole from opposite sides, so the stitch line has a slight slant and looks nearly the same on both faces of the leather. Machine lockstitch sits flat and identical top and bottom. This is one of the fastest things to check and one of the hardest to fake convincingly along a long curve.
Edge paint should be thin, smooth, and even, following the curve without pooling or dripping. Thick paint used to hide a rough cut is a warning sign. The same goes for the edges of the flap and the strap ends.
Leather, shape, and smell
Togo, Epsom, Clemence, and Swift each have a distinct grain and hand feel, and the grain should look natural rather than stamped in a repeating pattern. A new bag smells of tanned leather. A fake often smells of glue, dye, or nothing at all.
Set the bag on a flat surface and look at the silhouette. Feet should sit level, the flap should close with a firm click and align with the body, and the handles should hold their shape rather than flop outward. Small geometry errors show up in profile photos more than in close-ups.
Why receipts and boxes prove very little
Dust bags, rain covers, boxes, lock and keys, and even boutique receipts are sold separately and are easy to pair with the wrong bag. Receipt formats vary by boutique and by year, so a real receipt does not confirm that a specific bag came from that sale. Treat paperwork as context, never as proof.
When to pay for a professional opinion
Top-tier replicas have closed much of the gap in the details above, which is why a high-value purchase deserves a paid authentication. Photo-based services can flag problems, but a physical inspection with a loupe, a microscope, or an AI scanning device is the stronger check. For anything in four figures, budget for it the same way you budget for shipping.
Quick checklist
- Blind stamp crisp, correctly spelled, and consistent with the hardware lettering.
- Turnlock engraving sharp and cut, not lasered.
- Lock and keys numbered and matching.
- Slanted saddle stitching on both faces of the leather.
- Thin, even edge paint with no pooling.
- Natural grain, leather smell, level feet, a flap that aligns.
- Independent authentication before money changes hands.