The Hermès Birkin: sizes, leathers, blind stamps, and how to check a pre-owned one

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Hermès dates the Birkin to 1984, in its own account of a flight from Paris to London on which Jane Birkin, seated next to Jean-Louis Dumas, then the house's executive chairman, complained that she could not find a bag suited to her needs as a young mother. Dumas, Hermès says, sketched "a supple and spacious rectangular holdall with a burnished flap and saddle stitching" on the spot.

The details move depending on who tells the story. Rebag's Birkin history has the flight going from London to Paris. Christie's, in a May 2026 guide, dates the meeting to 1983 and the first prototype to 1984, and its September 2026 size guide says the bag "was released commercially in 1985". Sotheby's agrees with Hermès on 1984. None of it changes how to buy one, but it is a fair warning to check any Birkin fact against more than one source.

This guide sets out what the bag is, from Hermès' own pages and the published guides of two auction houses and two resellers; how a Birkin is dated and marked; and how to check a pre-owned one. It publishes no pre-owned prices. This is a documentary read of the bag, not a first-hand one.

The Birkin at a glance

Source: Christie's, "The Hermès Birkin: a complete guide to handbag sizes" (Emilie Murphy, 10 September 2026). The dimensions are those Christie's gives for the specific bags it pictures, and the "most" quote is from Max Brownawell, its vice president for handbags and accessories.

Sotheby's explains the naming: Birkin sizes "are named for the approximate length of the bag across its base in centimeters." It lists the 25, 30, 35 and 40 as the four core sizes, with the Birkin 20 and the Micro Birkin 15 as rarer formats, and says the Micro Birkin 15 was produced only in 2011 and 2012. Christie's September 2026 sale included a Birkin 15 dated 2010, so treat those years as approximate.

What the bag is made of

Sotheby's lists the parts that make a Birkin a Birkin: two rolled top handles, a structured base with protective clou feet, a flap closure, two leather sangles that fasten around a central turn-lock, and a padlock and keys housed in a leather clochette, with a single open compartment with pockets inside. Yoogi's Closet adds that the standard bag has four feet, and that the 50 and 55 cm sizes have six.

Both auction houses say each bag is made by a single artisan. The time quoted varies: Sotheby's cites a minimum of 18 hours, Yoogi's Closet 18 to 30, Christie's "up to 40 hours". Christie's describes the saddle stitch as sewn with two needles and one continuous thread passed back and forth through the leather.

Leathers. Sotheby's names Togo, Clemence, Epsom and Box as the most recognizable and describes how each behaves. Togo, introduced in 1997, is "relatively resistant to scratches" and softens with use. Clemence has a tendency to relax with age. Epsom's embossed grain helps a Birkin hold its shape. Box calf "can show scratches and watermarks more readily than grained leathers" but develops a patina. Hermès' own Birkin page offers a heritage leather, entirely vegetable-tanned natural cowhide that "gains a patina and becomes even more beautiful over time."

Hardware. According to Sotheby's, gold-plated and palladium-plated are the most common finishes, used on the turn-lock, sangles, padlock, keys, zipper and clou feet. Less common finishes include rose gold, permabrass, brushed palladium, brushed gold, ruthenium and matte black.

Retourné and Sellier. A retourné Birkin is stitched inside and turned out, which gives rounded edges and a softer silhouette; a Sellier has its stitching on the outside and sharper edges. Both auction houses agree on that. They do not agree on the Sellier's history: Sotheby's says Hermès first introduced it as a limited edition in 2010 and reintroduced it in 2020, while Christie's dates its emergence to 2014. Christie's adds that Sellier Birkins are typically made in 25, 30 and 35 cm, and that the 20 cm Birkin exists only in Sellier form.

How a Birkin is dated and marked

Hermès marks its bags with what collectors call a blind stamp. Rebag's guide to Hermès stamps explains that it combines a date stamp, which records the year, and a craftsman stamp, which records the artisan or group of artisans. On the Birkin and Kelly, it says, the stamp sits in a hidden place such as behind the plaques or in an interior pocket, and it can be hard to read because of wear or because soft leather lifts it.

Source: Rebag, "Hermès 101: Stamps" (July 29, 2020). Rebag's shortcut is that a D in a square is 2000; count through the alphabet from there. Its table stops at 2021, so check a later stamp against a current authenticator's reference. It also records two anomalies: some 2011 bags carry the O-in-a-square date stamp interlinked with a J craftsman stamp, and some late-2014 bags carry an R with no square, because Hermès moved to the new system early.

Two more marks are worth knowing. A horseshoe stamp means a special order: Yoogi's Closet puts it to the left of the Hermès stamp, above the turn-lock plaque, and Sotheby's describes special orders as letting select clients choose elements such as leather, color, hardware and stitching. And on exotic skins, Sotheby's says Niloticus crocodile is identified by two dots (••), Porosus crocodile by a caret (^) and alligator by a square, while ostrich carries no special symbol beside the Hermès stamp and is recognized by its follicles.

THE PENNYWEIGHT VERDICT

Skip — unless it will be your everyday bag for a decade.

Sotheby's puts 2026 US retail at approximately $13,500 for a Birkin 25, $14,900 for a Birkin 30 and $16,300 for a Birkin 35. The number is $51.92: the Birkin 25 carried once a week for five years, 260 carries, as our calculator runs it. Twice a week for five years is still $25.96, a Skip. Three days a week for ten years brings it to $8.65, and five days a week for ten years to $5.19, both inside Buy on sale. Getting under $2.00 a carry at that price takes more than 6,750 carries, which is our division rather than anyone's forecast.

That is the retail arithmetic, and Sotheby's also says that buying at retail is the hard part: Hermès, it says, allocates only a handful of Birkins to each boutique and direct buyers usually need a purchase history with the brand. We publish no pre-owned figure to set beside it, and our calculator's resale field stays at zero, for the reasons in our cost-per-wear method.

Buying it second-hand

A pre-owned Birkin is judged on three things: whether its description is internally consistent, what condition it is in, and whether it is genuine. The first two you can check yourself; the third needs an independent authenticator.

Identify it before you judge it. Establish the size from the base length, the construction from where the stitching sits, the leather from its grain, the hardware finish, and whether there is a horseshoe or an exotic-skin symbol by the stamp. Then check the parts against Sotheby's list: rolled handles, clou feet, flap, two sangles, turn-lock, and a padlock and keys in a clochette.

Read the blind stamp against the story. The date stamp should fit the year the seller gives, and it can expose a description that does not add up. A Birkin 25 whose stamp dates it before 2004, the year Christie's gives for that size, deserves a question, as does a Birkin 30 dated earlier than the 1990s. The same logic applies to a Sellier dated to a year that neither auction house's history covers, and to a special order with no horseshoe.

Grade the condition the way an auction house would. Sotheby's describes a Birkin in excellent condition as showing only minor scratches on the hardware, minimal wear on the handles and exterior, and a clean interior; its store-fresh examples have the protective plastic still on the hardware, complete accessories and original boxes. Ask for close photographs of each of those areas: the turn-lock, plaques and feet; both handles along their length; the base and the edges; and the interior. Factor in the leather — Sotheby's notes that Box calf shows scratches and watermarks more readily than grained leathers, and that Clemence tends to relax with age — and ask for a list of everything included: the padlock, the keys, the clochette, and any dust bag and box.

Know what can be repaired. Hermès' maintenance and repair page says all Hermès objects can be repaired and freshened up, and gives leather examples such as changing a bag zipper and mending seams, with requests handled through its customer service or stores. It publishes no repair prices, so price a worn bag as carrying a repair cost you do not yet know.

Look closely at the stitching. Christie's describes the saddle stitch as sewn by hand with two needles and a single continuous thread. Ask for close photographs of the stitching along the flap, the handles and the edges, and compare them with images from an auction house's catalogue of the same size and construction.

Judge the seller's claims. "Store fresh" should mean the protective plastic, accessories and box that Sotheby's describes. "Special order" should mean a horseshoe stamp. An exotic skin should carry the matching symbol, or none for ostrich. "Authentic" with no named authenticator is the seller's own statement, the same class of claim we examined in what "discount" means at a grey-market luxury reseller. The marks above tell you whether a bag's story is consistent; whether it is genuine is a question for an independent authenticator. Buy where that authentication happens before the bag reaches you, or where the return terms cover a bag an independent authenticator later rejects, and pay by a method that keeps a chargeback open.

Sources

• Hermès, Birkin page, hermes.com (US), read via the Internet Archive capture of 20 May 2023.
• Hermès, "Maintenance & Repair," hermes.com (US), read via the Internet Archive capture of 9 February 2023.
• Christie's, "The Hermès Birkin: a complete guide to handbag sizes" (Emilie Murphy, 10 September 2026) and "The aesthetics hidden in the stitching: Hermès Retourné vs Sellier Birkin" (14 May 2026), christies.com.
• Sotheby's, "Everything You Need to Know About the Hermès Birkin" (Vanessa Wat, August 20, 2026) and "Complete Guide to Buying and Selling a Birkin" (Vanessa Wat, January 28, 2026), sothebys.com.
• Rebag, The Vault: "Hermès 101: Stamps" (July 29, 2020) and "Hermès 101: The Birkin Breakdown" (July 17, 2023).
• Yoogi's Closet blog: "The Hermes Birkin Guide" (June 4, 2017) and "Why Do Some Hermès Birkin Bags Have Horseshoe Stamps?" (May 4, 2019).