You finally saved up for a Louis Vuitton Neverfull, or maybe you scored what looks like an amazing deal on a pre-owned one. You unbox it, admire the Monogram canvas, and run your fingers over the smooth leather. Then a thought creeps in: is this actually real? For anyone who’s ever bought a designer bag secondhand—or even new from a boutique—the question of authenticity is a nagging worry. The good news? Louis Vuitton has a built-in secret that can help you verify your bag’s story: the date code. But finding it on a Neverfull isn’t always straightforward, and knowing what to look for can save you from a costly mistake.

What Exactly Is a Louis Vuitton Date Code?

Let’s clear up a common misconception first: a date code is not a serial number. It doesn’t identify a specific bag the way a VIN identifies a car. Instead, it’s a combination of letters and numbers that tells you where and when the bag was manufactured. Think of it as a birth certificate for your Neverfull. The code typically consists of two letters followed by four numbers. The letters represent the factory location, while the numbers indicate the week and year of production. For example, a code like “AR4161” would mean the bag was made in France (AR factory) during the 41st week of 2021. Simple, right? Well, the tricky part is actually locating that tiny stamp on your bag.

Where to Look: The Classic Neverfull Locations

Louis Vuitton has changed where it places date codes over the years, so the spot depends on when your Neverfull was made. For most classic Neverfulls produced before 2021, there are two main places to check. The first is inside the bag, on the side seam of the interior pocket. Run your hand along the fabric edge of the large zippered pocket that sits against the back of the bag. You’re feeling for a small, rectangular leather tab sewn into the seam. The date code is heat-stamped directly onto that leather piece. It can be subtle—sometimes the stamp is faint, especially on older bags, so use good lighting and maybe even a magnifying glass.

The second common location is on the interior side of the bag, near the top edge. If you look inside the Neverfull, you’ll see a leather trim that runs along the opening. On some models, the date code is stamped directly onto that leather strip, close to where the handle attaches. This is more common on earlier versions of the bag. If you don’t find it on the pocket seam, check this area carefully. Pro tip: the code is almost always on the side opposite the hanging pochette, so start your search there.

What About the Neverfull MM, GM, and PM?

The size of your Neverfull doesn’t change the general location, but it can affect the ease of access. For the Neverfull MM, which is the most popular size, the pocket seam is your best bet. The GM, being larger, has more interior space, so the tab might be slightly easier to spot. The PM, the smallest size, has a tighter interior, so you’ll need to really dig in with your hand. A common frustration with the PM is that the tab can be tucked deep into the seam, making it feel like it’s not there at all. Don’t give up—gently pinch the fabric of the pocket seam and pull it outward. The tab is usually there, just hiding.

The Post-2021 Shift: No More Date Codes?

Here’s where things get a bit confusing. In early 2021, Louis Vuitton quietly started phasing out date codes in favor of a microchip system. If you have a Neverfull made after March 2021, you might not find a traditional leather tab at all. Instead, the bag has a tiny RFID chip embedded somewhere in the lining or leather. You can’t see this chip with your eyes—it requires a special scanner that Louis Vuitton stores use. This change was partly to combat counterfeiting, as chips are much harder to replicate than a simple stamp. So, if you’re looking at a brand-new Neverfull and can’t find a date code, don’t panic. It just means your bag has the newer technology. For pre-2021 bags, though, a missing date code is a major red flag.

Decoding the Letters and Numbers

Once you find the code, the next step is understanding what it says. The two letters indicate the country and factory. Common codes for the Neverfull include “SP” for France, “SD” for France, “AR” for France, “FL” for France, “MB” for Italy, and “SA” for the USA. The numbers are a bit more nuanced. For bags made before 2007, the format was three or four digits, with the first two digits representing the year and the last two representing the month. After 2007, Louis Vuitton switched to the current format: two letters and four numbers. The first and third numbers represent the week, and the second and fourth represent the year. For example, “SD2150” would be the 21st week of 2015. There are plenty of online databases that let you look up the factory code, but the key takeaway is that the code should be crisp, evenly spaced, and deeply embossed. Counterfeit stamps often look blurry, too large, or misaligned.

Common Pitfalls and Fakes to Watch For

Fake Neverfulls are everywhere, and counterfeiters often get the date code wrong. One common trick is placing the date code on a fabric tag instead of a leather one. If you find the code printed on a cloth tag sewn into the bag, it’s almost certainly a fake. Another red flag is a code that’s too easy to find—like sitting right in the middle of the pocket. Authentic date codes are often tucked away, requiring a bit of searching. Also, watch out for codes that don’t match the bag’s style. For instance, a code indicating a factory that never produced Neverfulls is a dead giveaway. And remember, if the bag claims to be from the 1980s but has a modern code format, something is off.

Practical Tips for Buying Pre-Owned

If you’re shopping for a pre-owned Neverfull, always ask the seller for a clear photo of the date code before you buy. A reputable seller will have no problem providing this. When you get the photo, check the stamp’s clarity and cross-reference the code with known factory locations. Also, consider the bag’s overall condition. A date code from 2010 that looks brand new might be a red flag if the rest of the bag shows heavy wear. Trust your instincts—if the deal seems too good to be true, it probably is. And if you’re still unsure, many authentication services will verify the code for a small fee. It’s a tiny investment that can save you from buying a fake.

Final Thoughts: More Than Just a Stamp

Finding the date code on your Louis Vuitton Neverfull is like uncovering a little piece of the bag’s history. It tells you where it was made, when it was crafted, and helps you spot a counterfeit. But don’t rely on the date code alone. Authenticators look at the canvas texture, the stitching, the hardware, and even the smell of the leather. The date code is just one piece of the puzzle. Whether you’re a seasoned collector or a first-time buyer, knowing where to look and what to look for gives you confidence. So next time you’re admiring your Neverfull, take a moment to find that tiny stamp. It’s a small detail that speaks volumes about craftsmanship and care.