Authentication Guide

Hermès Bag Authentication Guide

How to authenticate Birkin, Kelly, and other Hermès bags through blind stamps, leather analysis, stitching, hardware, and interior markings

By Mai, Founder of Treasures of Maimi

Hermès represents the pinnacle of luxury leather goods. The Birkin and Kelly bags are among the most coveted — and most counterfeited — accessories in the world. With retail prices starting above ten thousand euros and resale values that frequently exceed retail, the incentive for counterfeiters is immense. Sophisticated fakes, often called "super fakes," can deceive casual buyers, making expert authentication essential before any significant purchase.

As the founder of Treasures of Maimi, I source Hermès pieces directly from Japan's most trusted luxury resellers — Komehyo, Brand Off, and Daikokuya in Tokyo. These houses employ rigorous multi-step authentication processes that have made Japan the world's most trusted market for pre-owned Hermès. This guide shares the authentication knowledge I have developed through years of hands-on inspection of hundreds of Hermès bags.

1. Blind Stamp Dating System

Every Hermès bag carries a blind stamp — a small, heat-pressed marking on the leather that indicates the year of production, the craftsman who made it, and sometimes the atelier. Understanding this dating system is fundamental to authentication because counterfeiters frequently use incorrect stamps for the alleged production year.

Hermès uses an alphabetical system that cycles through the letters A through Z. The first cycle began in 1945 with A and reached Z in 1970. A second cycle ran from 1971 (A) to 1996 (Z). From 1997 onward, Hermès enclosed the letter within a shape to indicate the decade: a circle for 1997–2014 (A through R in circle) and a square for 2015–2024 (T through the current year in square). In 2025, Hermès transitioned to a new system without enclosing shapes, using a different identifier format.

The blind stamp is typically found on the front strap underneath the flap of a Birkin (below the turn closure) or on the rear leather panel of a Kelly. It should be cleanly pressed with consistent depth — not too shallow (suggesting a counterfeit stamp applied with insufficient pressure) or too deep (suggesting a crude manual stamp). Adjacent to the year letter, you will find the craftsman's mark — typically one to three letters identifying the individual artisan. Hermès artisans take personal pride in their work, and this mark is a meaningful part of the bag's provenance.

Key authentication point: the font of the blind stamp has evolved over the decades. Stamps from the 1970s and 1980s use a slightly different serif style than modern stamps. If a bag claimed to be from the 1990s has a stamp font consistent with 2010s production, that is a significant red flag.

2. Leather Types and Grain Analysis

Hermès offers its bags in a wide range of leathers, each with unique characteristics that are extremely difficult to replicate convincingly. Knowing what each leather should look and feel like is one of the most reliable authentication methods.

Togo Leather

Togo is the most popular Hermès leather, made from baby calfskin with a distinctive pebbled grain. The grain is naturally occurring and therefore slightly irregular — no two sections of a Togo bag will have identical grain patterns. The pebbles are medium-sized, round, and softly defined. Togo feels supple yet structured; it holds its shape when empty but yields when filled. The leather has a matte finish with a very subtle natural sheen. Counterfeit Togo often has grains that are too uniform, too glossy, or too sharply defined, suggesting machine embossing rather than natural grain.

Clemence Leather

Clemence is made from mature bull calfskin and has a slightly larger, flatter grain than Togo. It is softer and more relaxed, which means Clemence bags tend to slouch when unfilled. The grain has a gentle, organic flow. Authentic Clemence has a distinctly different hand-feel from Togo — it is heavier and more pliable. Counterfeit Clemence frequently feels either too stiff (suggesting a different leather with embossed grain) or too thin (suggesting inferior quality hide).

Epsom Leather

Epsom is a pressed calfskin with a fine, uniform crosshatch grain. Unlike Togo and Clemence, the grain on Epsom is deliberately created through a pressing process, resulting in a very regular, geometric pattern. Epsom is the most structured of the common Hermès leathers — bags made in Epsom hold their shape firmly even when empty. The leather feels slightly stiffer and lighter than Togo. Due to the pressed nature of the grain, Epsom is actually easier for counterfeiters to imitate, which means other authentication markers become more important when evaluating an Epsom bag.

Swift Leather

Swift is a smooth, fine-grained calfskin with minimal visible texture. It has a slight natural sheen and feels incredibly soft to the touch. Swift scratches more easily than grained leathers, but light scratches can often be buffed out with gentle finger pressure. Authentic Swift has a rich, saturated color quality that counterfeit versions rarely achieve — the depth and evenness of dye absorption on genuine Swift is a hallmark of Hermès tanning expertise.

Box Leather

Box calf is a polished, smooth leather with a high-gloss finish used primarily on vintage and formal bags. It develops a distinctive patina over time, becoming richer and more lustrous with age. Authentic Box leather has a mirror-like surface when new, with an even polish that does not appear artificially glossy. The leather is rigid and structured. Box is less common in modern production, so encountering a "new" Birkin in Box calf should prompt extra scrutiny.

3. Saddle Stitching — The Hermès Signature

Hermès bags are entirely hand-stitched using a technique called saddle stitching (sellier in French). This is perhaps the single most important authentication marker because it is extraordinarily labor-intensive and nearly impossible to replicate by machine. A single Birkin requires 18 to 24 hours of stitching by a trained artisan.

In saddle stitching, two needles work simultaneously from opposite sides of the leather, each passing through the same pre-punched hole. This creates a stitch pattern where adjacent stitches lean in alternating directions — one leans left, the next leans right. This alternating lean is visible under close inspection and is the hallmark of genuine hand-stitching. Machine stitching, by contrast, produces perfectly parallel stitches that all lean in the same direction.

The thread used is a waxed linen called fil au chinois. On authentic Hermès bags, the thread color is carefully matched to the leather — contrast stitching is intentional and specified by Hermès for certain color combinations. The waxed thread creates stitches that sit slightly proud of the leather surface with a subtle rounded profile. Each stitch should be identical in length and tension, yet the slight human irregularities (barely perceptible without magnification) confirm hand work. Perfect machine-like uniformity is actually a warning sign.

The functional advantage of saddle stitching is durability: if one stitch breaks, the opposing thread holds the seam together. This is why genuine Hermès bags can last for decades without seam failure, whereas machine-stitched counterfeits may unravel if a single thread breaks.

4. Hardware Analysis

Hermès offers hardware in several finishes: palladium (silver-tone), gold (yellow gold-tone), rose gold, and permabrass (a brushed gold). Each finish has specific characteristics that aid in authentication.

Palladium hardware should have a cool, bright silver tone with no yellow or warm undertones. The finish is smooth and consistent across all hardware pieces — the feet, the turn closure, the sangles hardware, and the zipper pull should all match exactly in color and finish quality. Gold hardware has a warm, rich tone that avoids appearing overly yellow or brassy. The plating depth on authentic Hermès hardware is substantial, meaning the finish endures years of use without significant wear-through. Counterfeit hardware often shows plating wear after minimal use, revealing a different base metal color underneath.

The "HERMES-PARIS" engraving on hardware should be precise, cleanly cut, and consistent in depth. Under magnification, the letters should have sharp, clean edges without burrs, rough spots, or inconsistent depth. The font used is specific to Hermès and has remained largely consistent for decades. Counterfeit engravings often appear shallow, have slightly different letter spacing, or show rough edges when magnified.

5. Lock, Key, and Clochette

The Hermès padlock and key set is an iconic element of the Birkin and Kelly. The padlock should feel substantial — it has a satisfying weight that reflects solid metal construction. "HERMES-PARIS" is engraved on one side, and a number (matching the key) is stamped on the bottom of the lock. This number should be cleanly stamped with consistent depth.

The keys come as a pair and are housed in a small leather case called a clochette, which hangs from one of the handles. The key number should match the number on the lock perfectly. Authentic keys have "HERMES" stamped into the key bow (the flat handle portion) with the same precision as other hardware engravings. The key should turn smoothly in the lock with no resistance or wobble.

The clochette itself is a hand-stitched leather key holder with the same saddle-stitch quality as the main bag. The leather should match the bag's leather type and color. The strap that attaches the clochette to the handle should be properly finished on all edges. Counterfeit clochettes frequently have inferior stitching, mismatched leather quality, or poorly finished edges.

6. Interior Stamp and Craftsman Mark

The primary heat stamp on a Hermès bag reads "HERMÈS-PARIS" on the first line and "MADE IN FRANCE" on the second. This stamp is found on the front strap of a Birkin (visible when the flap is lifted) or on the inner rear panel of a Kelly. The font is a specific serif typeface that Hermès has used consistently for decades.

Examine the stamp under magnification. Each letter should be cleanly impressed with consistent depth. The accent over the E in HERMÈS should be precisely positioned and clearly defined. The spacing between letters and between the two lines should be even and proportional. On authentic bags, the stamp appears to be pressed into the leather with professional tooling — the impression is clean without blurred edges or uneven pressure marks.

Counterfeit stamps commonly exhibit these flaws: letters that are too thin or too thick compared to genuine examples, uneven spacing between characters, an accent mark that is too small or incorrectly angled, misalignment between the two lines, and stamp impressions that are either too shallow (barely visible) or too deep (creating a rough, excavated appearance). The font itself may be subtly wrong — a serif that is slightly too long, a curve that is marginally different from the authentic typeface.

The craftsman mark (separate from the year stamp) identifies the individual artisan who created the bag. This is usually a small stamp of one to three letters near the year blind stamp. The presence and correctness of this mark adds to the authentication — Hermès maintains records of which artisans were active in which ateliers during specific periods.

Authentic vs Counterfeit: Comparison Table

Feature	Authentic Hermès	Counterfeit
Blind Stamp	Correct letter for year, proper shape enclosure, clean impression	Wrong letter/year combo, missing or incorrect shape, blurred impression
Leather (Togo)	Natural irregular pebbles, supple yet structured, matte finish	Uniform machine-embossed grain, too glossy, stiff or flimsy
Stitching	Hand saddle stitch, alternating lean, waxed linen thread	Machine stitch, all stitches lean same direction, synthetic thread
Hardware	Precise HERMES-PARIS engraving, consistent finish, substantial weight	Shallow or uneven engraving, finish variation, lightweight
Lock & Key	Matching numbers, smooth operation, clean HERMES stamp on key	Mismatched numbers, sticky mechanism, blurred stamp
Clochette	Saddle-stitched, matching leather, finished edges	Machine-stitched, different leather quality, raw edges
Interior Stamp	Clean serif font, correct accent, even depth and spacing	Wrong font weight, poor accent, uneven depth
Craftsman Mark	Present near blind stamp, verifiable against Hermès records	Missing, random letters, or inconsistent with production period

Why Source Hermès from Japan?

Japan's luxury resale market handles more authenticated Hermès inventory than any other secondary market globally. Tokyo's leading auction houses — Komehyo, Brand Off, and Daikokuya — have invested heavily in authentication expertise, maintaining teams of specialists who examine every aspect of each bag. The cultural value placed on honesty in commerce and the meticulous care Japanese owners take of their possessions create a supply of pre-owned Hermès in exceptional condition.

At Treasures of Maimi, our founder Mai personally sources Hermès pieces during buying trips to Tokyo, building on long-standing relationships with these trusted houses. Every Hermès bag we sell includes a Certificate of Authenticity, 14-day returns, and free shipping within the EU. Our reputation is built on the certainty that every piece is genuine.