Read down the maison files on this site in order and a pattern appears at the bottom of every dating system: an end date. Chanel's serial record runs 1986 to 2021 and stops. Louis Vuitton's date codes run four ciphers deep and stop in March 2021. Fendi's ladder of markings climbs from nothing to stickers to holograms and tops out at a radio chip. Forty years of anti-counterfeit technology, each generation adopted because the fakes had caught up with the last one, and the arms race ended in the strangest way possible: the houses took the date off the bag. This case is about that ending, and about what a buyer is left holding when the writing stops.
The bare decades
For most of the twentieth century a luxury bag carried no identifying code at all, because it did not need one. The product was the proof. A 1960s Kelly announced itself in the saddle stitching, and the only marks inside were craftsman's marks: the blind stamp was a workshop date and artisan record, pressed in for the house's own bookkeeping, not as a security device. Authentication in the bare decades was simply connoisseurship. You knew the needle's work or you did not. The register calls this the era before writing, and it matters to everything that follows, because the industry is going to spend four decades building code systems and then, as we will see, arrive almost exactly back here.
The sticker and the cipher
The writing began when the copying industrialized. Chanel started numbering bags in 1986, a sticker sealed inside the lining with a serial the lookup tool can still place to within a couple of years. Louis Vuitton ran its date codes through four successive ciphers, the ones the decoder untangles, including the 2007 month-to-week switch that still catches people. Dior adopted its interlaced cipher around 1997. Balenciaga stamped season letters. Each system was a response to the copying of the era before it, and each was defeated the same way: the counterfeiters copied the marking too. This register has a standing rule, written up in The Counterfeiters' Favorite, that the code is the cheapest part of the bag to copy, and the whole sticker-and-cipher era is that rule playing out in slow motion. A correct serial on a fake Chanel stopped being rare a long time ago. The stickers themselves aged, peeled and fell off, and their failure modes became a second literature: collectors learned to read the wear on a hologram the way they read the serial under it.
The chip arrives early, once
Fendi went electronic first, and almost nobody noticed. The house's marking ladder, the one the serial era guide walks through, reaches RFID in 2010, a full decade before the rest of the industry. The chip was invisible, which was the point: a marking the counterfeiter cannot photograph is a marking he copies late and badly. And it produced the cleanest era test in this register as a side effect. The Fendi First exists only in the chip years, so any First with pre-chip markings is impossible by definition, no expertise required. That is the honorable version of what chips do for a buyer: they draw a hard line in time, and the line itself becomes a dating instrument.
2021, the year the writing stopped
Then the two biggest code systems in the world ended in the same year. Louis Vuitton stopped printing date codes in March 2021 and embedded an RFID chip instead. Chanel retired both the serial sticker and the authenticity card in 2021 in favor of a metal plate with an engraved eight-character code and a chip behind it. And here is the detail the register cares about: by the published accounts, the new Chanel code does not encode a date at all, and the chip can only be read by the house's own scanners. Think about what that means. Every marking generation before this one was legible to the person holding the bag. A serial could be looked up, a cipher could be decoded, a blind stamp could be read against a chart; this entire site is built on that legibility. The chip is the first marking in forty years that the owner cannot read. It protects the house's supply chain beautifully. It tells the secondhand buyer nothing, and the houses are explicit that the boutiques will not read it for resale purposes. The arms race ended with the date removed from the bag and the verdict moved behind a counter you cannot visit.
Back to the needle
Which brings the register back to where the bare decades left it. With the legible marks retired, what remains on a chip-era bag is what was always there: the needle. The stitching, the construction, the materials, the parts of the object that cost real money to imitate. The houses that never played the code game turn out to have been running the chip era's playbook all along. Hermès never adopted a serial or a chip; the blind stamp and the saddle stitch still date and defend the bag the way they did in 1960. Bottega Veneta never wrote anything on the outside at all, and No Logo showed that its woven intrecciato is handwriting that dates like a font. The chip did not make craftsmanship obsolete as evidence. It made craftsmanship the only evidence the buyer can still examine personally.
What the file says to do
The practical doctrine, and it is more good news than bad. First, the closed systems are now finished historical records, which makes them better dating instruments, not worse: every serial, cipher and stamp this site's tools decode belongs to a bounded era that no new production will ever blur, the point Date First was built on. Second, the 2021 cutover is itself a gate. A Chanel sold as current production wearing a serial sticker is contradicting itself; a Louis Vuitton with a date code is telling you it predates March 2021, and a claimed older bag with chip-era markings is impossible in the other direction. The ends of the systems date bags as firmly as the systems did. Third, on anything made after the writing stopped, judge the needle, because that is what you have: construction first, hardware and zip witnesses second, and no comfort taken from a chip you cannot read. The chip is the house talking to itself. The stitching is the bag talking to you, and it has never once changed its story.