Free Tool
Saint Laurent Serial Number Checker
Enter the serial number from the leather tab inside your Saint Laurent or Yves Saint Laurent bag to identify its format and approximate production era.
Enter your serial number
Find the rectangular leather tab sewn into the interior lining of your bag. The serial number is embossed or heat-stamped on it — on some models it may be on two lines. Enter all digits and letters together. Examples: 5534820, 638602 1YF07. Spaces and hyphens are ignored.
A serial number alone does not prove authenticity.
High-quality counterfeits replicate correct serial formats. Always verify leather grain, hardware weight, stitching tension, and the interior lining quality alongside the serial. Get a professional authentication →
Serial Number Formats by Era
The brand underwent a major rebrand in 2012 — from Yves Saint Laurent to Saint Laurent Paris — which also shifted the format and length of interior serial tags.
| Era | Format |
|---|---|
| Pre-2000 (Vintage YSL) | Short numeric (4–6 digits) |
| Late 1990s – 2012 (YSL era) | Numeric (7–10 digits) |
| 2012 – present (Saint Laurent) | 11+ digits or alphanumeric |
Where to Find the Serial Tag
The serial tag is a small rectangular leather patch sewn into the interior lining. Location varies by model.
| Model | Tag location |
|---|---|
| Lou Lou | Rectangular leather tab sewn into the interior lining, usually on the back wall |
| Sunset | Leather tab inside the main compartment, often near the zip pocket |
| Kate | Interior leather tab on the back wall or side lining |
| Sac de Jour | Leather patch on the interior back wall |
| Niki | Leather tab sewn into the lining on the interior side wall |
| Envelope | Interior leather tab, typically visible when the bag is open flat |
| Matelassé / Uptown | Leather tab inside the main compartment |
| Vintage Muse / Tribute | Tag may be faint on older pieces; check all interior seams |
YSL vs Saint Laurent — what should my tag say?
Bags made before 2012 will have Yves Saint Laurent on the interior tag and hardware. Bags made after the 2012 rebrand read Saint Laurent Paris or simply Saint Laurent. A mismatch — e.g. "Saint Laurent" branding on a bag with an old-style serial — is a red flag worth investigating.
No serial tag on my bag?
Very early vintage YSL pieces (pre-1990s) may have only a simple brand stamp and no dedicated serial tag. For any bag from the 2000s onwards, a missing serial tag is unusual and warrants professional authentication.
Want the full authentication guide?
Read Saint Laurent serial numbers explained for all three format eras, where the tab sits by model, and the consistency check that catches mixed-reference fakes.
Frequently asked questions
- Where is the serial number on a Saint Laurent bag?
- The serial number is embossed on a small rectangular leather tab sewn into the interior lining of the bag. The exact position varies by model — on the Lou Lou and Sunset it's typically on the back wall of the interior; on the Kate and Envelope it may be on a side panel.
- What is the format of a Saint Laurent serial number?
- Saint Laurent serial numbers are typically numeric (4–11+ digits) or alphanumeric for newer pieces. Pre-2012 Yves Saint Laurent bags tend to have shorter numeric codes; post-2012 Saint Laurent Paris bags often have longer codes, sometimes combining digits and letters.
- Should my tag say Yves Saint Laurent or Saint Laurent?
- It depends on when the bag was made. Bags produced before the 2012 Hedi Slimane rebrand read 'Yves Saint Laurent' on the interior tag and hardware. Post-2012 bags read 'Saint Laurent Paris' or simply 'Saint Laurent'. A mismatch between the branding and the serial format is a red flag.
- Does a valid Saint Laurent serial number prove the bag is authentic?
- No. A valid-looking serial number is a useful indicator but not proof of authenticity. Quality counterfeits replicate plausible serial formats. Authentication also requires examining leather grain, hardware weight, stitching tension, and interior lining quality.
- My vintage YSL bag has no serial number — is it fake?
- Not necessarily. Very early Yves Saint Laurent pieces (pre-1990s) were often made without a dedicated serial tag, carrying only a brand stamp. For bags from the 2000s onwards, a missing serial tag is unusual and worth investigating further.