Most people call the number inside a Chanel a "date code" and stop there. The catch is that Chanel runs two separate dating systems, and the market constantly mixes them up.
- One is the serial series number on the interior sticker. It dates a bag to a year range.
- The other is the season code (the `18C`, `23S`, `26A` form) printed on the retail and garment tag. It names the exact collection.
They live in different places, and they tell you different things. Read this as a dating aid: It tells you how Chanel encodes time and gives you the markers to check, not a verdict on whether a specific bag is genuine.
One honest note up front, because it shapes everything below. Chanel has never officially published either system. Everything here is the consensus of resellers, authenticators, and collector forums, cross-checked across at least two independent references per claim. That is why the serial years stay as ranges, never a single false-precise year.
The two systems, side by side
The serial series number:
- Looks like: A 6-to-8 digit number, for example `23xxxxxx`.
- Where it lives: The interior sticker or authenticity card (pre-2021).
- What it tells you: The production year, as a range.
- What it does not tell you: The collection. It cannot separate Cruise from Fall.
- Era: Mid-1980s to 2021.
The season code:
- Looks like: Two year digits plus a letter, for example `18C`, `23S`.
- Where it lives: The retail price tag or hangtag, and the garment (ready-to-wear) label.
- What it tells you: The exact collection, that is Cruise, Spring, Fall, and so on.
- What it does not tell you: Nothing finer. It is the collection name.
- Era: Still in use. It is the only on-item season source after 2021.
The key consequence: A serial sticker dates a bag to a year-ish, and the season code (when the tag survives) names the precise collection. After the 2021 microchip switch, the retail tag is the only place the season lives on the bag at all.
The season code: What `18C` means
The season code is the deterministic part, and it is the system this catalog uses to say "Cruise 2018." The rule is mechanical. The two digits are the year, the letter is the collection.
- C: Cruise / Resort (Croisière), typically released in November of the prior year.
- P: Spring / Summer Act 1 (Printemps), typically January.
- S: Summer / Spring-Summer Act 2, typically March.
- A: Métiers d'Art on a modern tag (see the trap below), typically May.
- B: Fall / Winter Act 1, typically July.
- K: Fall / Winter Act 2, typically September.
- M: Coco Beach, a seasonal beach capsule, timing varies.
So `18C` is Cruise 2018, which showed and shipped in November 2017. `23S` is the 2023 Summer (Spring-Summer Act 2) collection. `26A` is Métiers d'Art 2026. Once the legend is fixed, every code resolves by formula. You do not need a separate source for each one.
The C quirk is the one to remember: A Cruise code always releases the prior November but carries the show year.
The letter legend is cross-checked across PurseForum, PurseBop, and Coco Approved, which all agree. The `M` (Coco Beach) row is a capsule rather than one of the six core runway collections, so it carries lower confidence. It is confirmed off `24M`-tagged items, but it is not a main-line collection.
Trap 1: The vintage-A problem
This is the one that trips people up most. On a modern tag, `A` means Métiers d'Art. On an older tag, it does not.
- On vintage ready-to-wear labels, roughly the 1990s through the 2000s, A meant Automne, that is Autumn or Fall, the main Fall-Winter collection.
- A collector on PurseForum documented a 2005 Fall runway piece labeled `05A`.
- The modern `B` and `K` split (Fall Act 1 and Act 2) is the newer convention. Vintage Fall pieces were commonly just `A`.
So read `A` by era: Fall on a vintage tag, Métiers d'Art on a modern one.
Where does A flip from one meaning to the other? No source pins it to a single year. The working boundary is around 2012, and we hold that as an estimate, not a hard line. So if you are reading an `05A` or an `08A`, that is a Fall piece, not Métiers d'Art.
Trap 2: The 2021 microchip cutover
In April 2021, Chanel moved from serial stickers plus authenticity cards to an NFC microchip, a small metal plate. Here is what changed for dating:
- The chip holds a random 8-character alphanumeric code with no year and no series number. It is readable only by Chanel's in-store NFC equipment.
- Authenticity cards were discontinued.
- 2021 is the overlap year. Depending on the production batch, a 2021 bag may carry either a final series-31 sticker or a microchip.
The practical takeaway: For a microchip-era bag, the retail price tag with its QR code is the only on-item way to read the season. No tag, no on-item season, and you fall back to the runway archive or a reseller listing to place the collection.
This is also why "why doesn't my new Chanel have a date code" is a question more people are asking as microchip bags reach resale. The answer is that the year simply is not on the chip.
The serial series number: Dating by sticker (pre-2021)
For any bag from the sticker era, the serial series number dates it to a year range. These are ranges on purpose. Two independent reseller-authenticator references (Xupes and Couture USA) agree on the shape and most anchor points, and where they differ by about a year at a boundary, the range below spans both, which is the honest representation.
A quick digit-count tell before the list: Series 0 through 9 are 7-digit serials, and series 10 and up are 8-digit serials. The very earliest bags carry a 6-digit serial.
The series number (what the serial begins with), then its approximate year range:
- 1xxxxxx, early 6-digit: 1984 to 1986.
- 0xxxxxx: around 1986.
- 1xxxxxx (7-digit): 1989 to 1991.
- 2xxxxxx: 1991 to 1994.
- 3xxxxxx: 1994 to 1996.
- 4xxxxxx: 1996 to 1997.
- 5xxxxxx: 1997 to 1999.
- 6xxxxxx: 2000 to 2002.
- 7xxxxxx: 2001 to 2002.
- 8xxxxxx: 2003 to 2004.
- 9xxxxxx: 2004 to 2005.
- 10xxxxxx: around 2005.
- 11xxxxxx: around 2006.
Do not over-read the series number as a collection. It dates the bag to a year-ish. It does not distinguish Cruise from Fall. For the collection you need the season code off the retail or ready-to-wear tag.
What this does and does not tell you
This is a dating aid, the markers to check, not an authentication verdict.
- A code that resolves cleanly tells you when a bag was made and which collection it belongs to.
- It does not on its own confirm a bag is genuine. A code that looks right can sit on a fake.
- If you are confirming authenticity, treat the date logic as one consistency check among many, and leave the final call to a professional authenticator.
And remember the honest gap underneath all of it. No house-published reference exists, so every year here is a sourced consensus, cross-checked across resellers, authenticators, and collector forums, not Chanel's own word.
