The short version: To check a designer bag before buying secondhand, test the seller and the price first, then the bag: leather, stitching, edges, hardware, stamps and the serial or date code, all against the brand’s standards for that year. At Vestiaire Collective about 8% of items submitted fail authentication, so the checks are worth ten minutes.
Buying a designer bag secondhand is one of the best-value moves in fashion. It is also the purchase where a bad decision costs the most, because the counterfeit trade is built to fool exactly the person who has done a little reading and none of the handling. Vestiaire Collective, the luxury resale platform, said in 2022 that its authenticators had rejected €360 million worth of items since 2020, and that about 8% of submissions failed, according to FashionUnited. That is the rejection rate at a platform where sellers know they will be inspected.
What follows is the order a professional works in, adapted for someone standing in a vintage shop or scrolling a listing. It will not turn you into an authenticator. It will stop you buying the obvious fakes, and tell you when to walk away from the rest.
Why should you check the seller before the bag?
The seller and the price tell you more, faster, than any stitch count. A bag offered by a reseller that authenticates in-house, guarantees its verdict and takes returns has already passed a filter you cannot replicate at home. A bag offered by a stranger with three photographs and no history has not.
One. Ask where the bag came from. A receipt, an original purchase record or a repair history from the brand is the strongest evidence there is. A story without paperwork is only a story.
Two. Ask for more photographs than you need: the interior, the underside of the hardware, the heat stamp, the serial or date code, the zip pull from both sides. A genuine seller will send them. A seller who refuses is answering your question.
Three. Know what the platform will do if it goes wrong. Retyche, an online pre-owned luxury reseller, advises buyers who discover a fake to contact the seller and the platform, use the marketplace’s buyer protection or a card chargeback, and keep every message and photograph. Read those terms before you pay, not after.
How much should a genuine designer bag cost secondhand?
A genuine bag from a sought-after house rarely sells for a small fraction of its new price. Retyche estimates that authentic bags typically hold around 50% to 80% of retail value on the secondhand market, while counterfeits tend to be priced at around 10% to 30% of what the genuine article fetches. Its example is a Chanel Classic Flap listed at $800 when authenticated versions sell for more than $6,000.
Use the price as a test, not a verdict. A bag priced far below what the same model sells for at reputable resellers needs a reason: visible damage, a missing strap, an urgent sale. If no reason is offered, the low price is the reason. We looked at which bags hold their value best in Fashionphile’s latest resale ranking, led by the Louis Vuitton Speedy, which is a good place to set a benchmark before you shop.
What do you check on the bag itself?
Work from the outside in, the way Vestiaire Collective describes its own process: exterior first, then interior, then the accessories such as the dust bag, strap and packaging. Five checks do most of the work.
One. Leather and weight. Genuine leather shows natural pores and small irregularities. Counterfeits are often lighter, smoother and more uniform, and can carry a chemical smell. The Handbag Clinic, a UK handbag repair and resale specialist, notes that a genuine Mulberry is usually cut from thick, grained calf leather that feels sturdy and holds its shape. Weight, texture and smell are the hardest things for a counterfeiter to copy.
Two. Stitching. Machine stitching on a genuine bag is straight and even, with every stitch the same length. Counterfeit stitching tends to be thick, wandering and inconsistent, especially at corners and where handles meet the body. Vestiaire Collective makes one useful distinction: irregular hand-stitching can be a sign of artisanal work, so judge the stitch against how that model was made.
Three. Edges. Look at the painted or dyed edges of the handles and straps. Genuine edges are smooth and even in width. Messy, cracked or blobby edge paint is one of the quickest tells on a fake.
Four. Hardware. Real hardware is solid metal and feels heavy in the hand. Vestiaire flags light or hollow metal and discoloration as warning signs. Engravings should be sharp and evenly spaced. Zips matter too: The Handbag Clinic notes that Mulberry uses RiRi zips or its own branded zips, marked on the underside.
Five. Stamps, logos and typography. Heat stamps should be centred, crisp and in the correct font for that period. Vestiaire’s authenticators check the shape, spacing and colour of lettering against the brand’s standards for the era. Monogram canvas should line up at the seams. A logo that is nearly right is a fake.
How do serial numbers and date codes work?
Serial numbers and date codes help, but they are the easiest part of a bag to copy, so treat them as a cross-check rather than proof. The useful question is not whether a code is there, but whether it matches the model, the materials and the period.
One. Louis Vuitton. Bags made after 1990 typically carry a date code of two letters and four numbers, such as AR1004, according to Retyche. The house stopped issuing physical authenticity cards in 2021 and moved to NFC chips.
Two. Chanel. Retyche notes seven-digit serial codes on bags from 1986 to 2005, eight-digit codes from 2005 to 2021, and metal plates with microchips since 2021. A code format that does not match the bag’s era is a red flag.
Three. Mulberry. Modern Mulberry bags carry a unique serial number on the brass disc, although some older and outlet bags have none, according to The Handbag Clinic. Counterfeits often get the font of the number wrong. The same source makes a point that catches buyers out: only about 30% of Mulberry bags were made in England at the time of writing, in 2021, so a “Made in Turkey” or “Made in China” tag on a newer bag is not, on its own, a sign of a fake.
Vintage complicates all of this. Vestiaire Collective notes that vintage bags rarely have serial numbers at all, which is why its authenticators start by placing the bag in its collection and era before looking at anything else.
Is a genuine bag a good bag?
Authenticity is the floor, not the verdict. A bag can be entirely genuine and still be a poor buy: corners worn through, handles cracked, lining stained, a strong smell of smoke, or a repair done badly by someone other than the brand. We argued in August that an authentication guarantee proves an item is genuine and says nothing about whether it is any good, and the same applies to your own inspection.
Run a second pass for condition. Check the corners and base for wear. Flex the handles and look for cracking where they bend. Open every pocket. Smell the interior. Ask whether any part has been replaced, and by whom. Then price the repairs before you agree the price.
When should you pay for professional authentication?
Pay for a professional check whenever the bag costs more than you could comfortably lose, or when the seller cannot offer a guarantee. Services range from reseller inspections to device-based checks: Retyche, for example, offers buyers an Entrupy certificate, which uses microscopic imaging and software, for $75 Canadian at checkout. Photo-only authentication catches the obvious fakes. Physical inspection catches more.
Vestiaire Collective told FashionUnited in 2022 that it employed 60 authenticators, each checking more than 40,000 items a year, across centres in France, the UK, the US, Hong Kong and South Korea. That is the scale of expertise you are buying when you pay a platform’s fee, and it is worth weighing against the saving from buying privately.
Frequently asked questions
Can you tell a fake designer bag from photos alone?
Sometimes. Clear photos of the heat stamp, hardware, stitching and serial code will expose the obvious fakes, and resellers use photo checks as a first filter. But weight, leather feel and smell cannot be judged on a screen, and the better counterfeits are made to pass photo checks. For an expensive bag, insist on a physical inspection or a guarantee.
Does a missing dust bag or box mean a bag is fake?
No. Packaging gets lost, thrown away or sold separately, and genuine bags often change hands without it. Counterfeiters also make convincing boxes and dust bags. Packaging can support a bag’s story, but its absence proves nothing and its presence proves very little.
Is a bag with a “Made in China” tag always fake?
Not necessarily. Many houses make some lines outside their home country, and the country on the tag has to match what that brand used for that model and year. The Handbag Clinic’s Mulberry guide is a good example: tags from Turkey or China are common on newer Mulberry bags. Check the tag against the model, not against assumptions.
What should I do if I bought a fake bag?
Stop using it, keep everything, and act quickly. Contact the seller and the platform, open a claim under the marketplace’s buyer protection, and if that fails, ask your card provider about a chargeback. Retyche advises keeping all documentation, including listings, messages and the authentication report that confirmed the fake.
Which designer bags are most often counterfeited?
The most recognisable and most resold models attract the most counterfeits, because that is where the money is. Monogram canvas bags, quilted flap bags and long-running classics are the usual targets. The more famous the bag, the more carefully it needs checking, and the more valuable a reseller’s guarantee becomes.
The honest takeaway
Buying secondhand is still the smartest way into a well-made designer bag, and checking one is a skill anyone can learn. Start with the seller and the price, handle the bag slowly from the outside in, treat the serial code as a cross-check, and judge condition separately from authenticity. When the bag costs more than you can afford to lose, buy the guarantee.
The next move is yours.
Sources: Vestiaire Collective, How we authenticate a pre-loved bag · FashionUnited · The Handbag Clinic · Retyche
