Longchamp
generalDate code & serial
Le Pliage does not use a dated 'date code' like some luxury houses. Instead, an interior white fabric tag carries a country-of-origin letter code (widely reported as AA = France, AE = China, AB = Tunisia) plus a printed style/model/color number, and this is said to match a serial printed on the yellow-and-white plastic dust cover a new bag ships in. Note the letter codes are not an exhaustive list of where Longchamp produces: the house also uses sites/partners in Mauritius, Romania and Morocco, so a code you don't recognize is not automatically a fake tell.
What to checkConfirm the interior white tag code and the number on the original plastic cover match, and that numbers are cleanly printed/stamped rather than handwritten or crooked. Treat the exact digit-layout of the style number as unverified — enthusiast sources describe it inconsistently and a specific 'line code' (e.g. '089') could not be corroborated — so use the number only as an internal consistency cross-check, never a standalone pass/fail. Country of origin is not itself a verdict: France, China and Tunisia are all legitimate.
Red flags & tells
Misspelled or malformed logo engraving
generalThe brass snap and zipper pull should read 'Longchamp' with '1948' (the founding year) and a horse-and-jockey. Fakes have been seen reading 'Loncchamp' or with a G that looks like a C, and on counterfeits the horse and jockey bodies often blur together instead of reading as distinct, detailed figures. Superfakes increasingly reproduce this correctly, so a correct stamp is not proof of authenticity.
Rough, hairy, plasticky or thin 'leather' flap and handles
generalThe flap and handles are genuine leather with a smooth grain on authentic bags; a rough, fuzzy, plasticky or overly thin flap is a common counterfeit tell and one of the harder things for cheap fakes to fake. Judge against the correct era/model, since leather finish has varied.
Stitching color and quality off
generalAuthentic flap/edge stitching is generally described as sturdier and cream-toned with reinforcement at stress corners; fakes tend to show thin, glaring bright-white or mismatched-beige stitching that contrasts wrongly with the nylon. Subjective and best judged side-by-side against a known-genuine reference.
Snap not reinforced with a clear disc
uncertainSome authentic Le Pliage bags have a small transparent reinforcement disc behind interior-pocket and base snaps, and several guides report fakes omit it. This varies by era/model and is not consistently documented, and superfakes reproduce it — confirm against the specific model rather than treating absence as proof.
Missing or wrong YKK zipper markings
uncertainMost modern nylon Le Pliage zippers are YKK. However, older/vintage authentic bags legitimately used non-YKK zips and may read 'Paris' or 'France' under the jockey with no YKK/size engraving at all, so absence is era-dependent and not conclusive. Do NOT treat a specific size stamp ('45' / '5NO') as a Longchamp authentication mark — those are YKK's generic #4.5 and #5 coil-gauge sizes sold to every manufacturer, not a brand signature.
Tag code does not match the dust-cover number
generalThe interior white-tag serial is said to correspond to the number on the original plastic cover; a mismatch, or a crooked/handwritten tag, is a warning sign. Absence of the cover on a resale item is NOT proof of a fake, and the presence of a matching cover is not proof it is real.
Shallow, flat, blurry logo embossing on hardware
uncertainGuides report authentic snap/hardware stamping is crisp and cleanly embossed; a shallow, blurry or uneven stamp is a frequent counterfeit indicator. Subjective, best judged side-by-side, and defeated by good fakes.
The honest caveat
Sources are enthusiast/reseller authentication blogs and forums (PurseForum, thebeautyjunkee, ilovelongchamp, extrabux, asterialoves, littlemisshautecouture), not Longchamp itself, so specifics vary by era and model — treat as corroborating guidance, not spec. Key caveats: (1) Longchamp genuinely produces in France, China AND Tunisia (and also Mauritius, Romania, Morocco), so 'made in China' is NOT a fake tell — this is a common myth, and the AA/AE/AB code list is not exhaustive. (2) The style/serial digit layout is described inconsistently across sources and a specific 'line code' (089) could not be verified — use the number only as a consistency cross-check and mark uncertain. (3) YKK zipper size stamps like '45' / '5NO' are just YKK's generic #4.5 and #5 coil gauges used industry-wide, NOT a Longchamp authentication mark; and older authentic bags legitimately used non-YKK zips ('Paris'/'France' under the jockey) with no YKK markings at all, so absence is era-dependent. (4) Superfakes increasingly reproduce the 'Longchamp 1948' snap, YKK-style zippers, the reinforcement disc and clean stamping, so no single tell is decisive — weight construction quality, stitching consistency, leather grain and the tag/cover cross-check together. Avoid absolutes like 'authentic never made in X' or 'the plastic cover proves it's real.' This is reference guidance to assist a human authenticator, never a standalone verdict.