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Spotting Fake Bags by Their StitchingFake Handbag Stitching FilterLouis Vuitton Speedy 25 Louis Vuitton Speedy 30 Louis Vuitton Speedy 35 Louis Vuitton Speedy 40 Coach Madison Sabrina Coach Madison OP Art Coach Madison Carryall Coach Madison Maggie Coach Madison Audrey Coach Poppy Graffiti Handbag Coach Poppy Tote Coach Poppy Wallet Coach Poppy Wristlet Coach Beach Tote Coach Julia Tote Coach Charm Tote Coach Kristin Collection Coach Peyton Collection Coach Brooke handbag Coach Carly Handbag Coach Zoe Handbag 
QSS is the front line of the UhBAD filter, representing the quality, symmetry and spi of an item's stitch lines. This is the framework all fake handbag detection is nested in. 1.) Quality: This refers to the quality of the individual stitches. The stitches should not be unraveling in places. They should not be a cheap weave, fabric etc. They should appear tight and firm in the material. 2.) Symmetry: This refers to the spacing and linear pattern of the stitch line, as well as the size of the stitches. The stitch lines should always be equal distance from the edge of the leather from every point of the stitch line. If the stitch line starts out ¼ inch away from the edge of the handbag, it should remain ¼ inch away from the edge of the bag the entire length of the stitch line. The lines should follow a strait path from a → b, remaining consistent throughout the handbag. If the stitch line appears crooked in certain areas, out of place, or pointing in different directions etc, this is a red flag. Erratic stitch lengths are also red flags. Such that the individual stitch lengths themselves must also be taken into consideration. Beware of asymmetric stitch lengths, whereas one stitch is twice as long as the previous stitch etc. The stitches must be generally uniform in length.
(*) Once Quality and Symmetry have been sufficiently established, SpI testing should follow. 3.) SpI [Stitches per Inch]: This is measurment of the number of stitches visible in a specified distance on the handbag (or any garment). [SpI test || t(SpI)]: This is a comparison of the amount of stitches per inch [SpI] between an authentic handbag (Ã), and a handbag in question (x). Spi is inversely proportional to the size of the individual stitch. The longer the stitch the smaller the spi. The high-end handbags generally have smaller individual stitches then their imposters, and therefore a larger spi value, whereas this increased spi value translates into improved quality. Smaller stitches = more stitches required to complete the handbag, thus creating a more durable, higher quality item, however this will increase manufacturing costs. Furthermore, larger stitches = less stitches = lower quality, which will decrease manufacturing costs. Therefore many counterfeit handbags will often have larger individual stitches, as it costs less and saves time. † This is not the same concept as the erratic stitch lengths reviewed in the symmetry section. The stitches in a counterfeit bag may very well be uniform in length with each other. However, they may be longer in overall length than their authentic analogues. And this will lead to an identifiable clue. This single identifier, (spi), can be applied to all counterfeit handbags. The ideal way to scrutinize the spi values is to count out how many stitches are in 1-4 inches of an authentic handbag. This establishes a working spi value. Example: If 20 stitches are counted out in a three inch span of stitch line on an authentic bag, then within the same three inch span on a similiar bag (x), you should expect about the same 20 stitches. The about is important: Authentic bags will not always have percise spi values. There will be some deviation, (we will get to this later). The below example violates acceptable SpI:
This is a powerful detector. Often times this test will not get off the ground because data from an authentic handbag analogue is not available. But when it is, this is a very powerful tool. Beyond this initial introduction, the concept of spi can be further drilled down into more accurate models by using our SpI filter. To utilize the filter, you will need accurate Spi readings, (an spi count on an authentic analogue bag must be first established). One way this can be done is by examining pictures of verified authentic bags from the official brand websites. Or by using sites like ebay and finding trusted sellers and utilizing their pictures to compare. Once you have two bags: 1) an authentic bag, and 2) a similiar (authenticity unknown) bag for comparison, you can apply our SpI filter to the handbags. The SpI filter handles the problem of the exact stitch match mentioned earlier. The filter sets up a target spi range (anchored by the authentic handbag spi value) for the unknown bag (x) to target. If bag (x) misses the target spi range, then that result is considered a red flag. Note: A consistent area to test is the top stitch of the interior or exterior label. This is a simple way to get two comparable areas. However, testing any stitch line on handbag X works as long as it is being compared to the exact spot on the authentic analogue bag. F/N: A sufficient measurment is in the range of 1-4 inches of stitch line. SpIT filter: Click SpI 1.0 to enter SpI details. Updated version available: SpI 1.1 (i) The SpI 1.1 version sets a threshold whereas when both spi values are greater than 15 they are entered into a second filter. [The argument behind the SpI Filter 1.0 | 1.1] For manual calculation (SpI 1.0):
For an example of the SpIT filter utilized in one of our guides go here. * X = Handbag (X) [Bag in filter] * X˜ = the number of stitches per inch/es [SpI] on handbag (X). The distance measured to determine (X˜) must be the same distance used to determine (Ã). * à = the number of stitches per inch/es taken from a comparable authentic handbag. Measuring spi within 1-4 inches is sufficient, or simply measure top stitch line of the interior or exterior label. * Ps=Pass stitching filter * Re=rejected from filter * 1 = true * 0 = false †) ⇒ X˜ = (.833*Ã) ∨ (1.2*Ã) ∴ P(A|B)= N -.025 ††) ⇔ SpI=0 ∴ P(A|B)= N - .025 †) If SpI of (X˜) comes in at exactly as a (20%) increase or (16.7%) decrease from the SpI of (Ã), then 2.5% should be subtracted from the percentage of the handbags final authenticity probability. ††) If the SpI data is unavailable, then 2.5% should be subtracted from the final authenticity P(A). * A = X is authentic * B = X passes UhBad filter * N = final authenticity probability % * p = penalty Examples of QSS: Quality: High quality stitching Symmetry: Strait, neat stitching Size: Stiches per inch F/N: As we said above, even if the brands are different, this technique will illustrate the quality differences between fake bags and real bags at the very foundation of the handbags. Despite how good the counterfeit bag may look, if the stitches per inch are less than the real deal, the bag is fundamentally a lower quality product. Think of it like the foundation of a house. Who would buy a house with a questionable foundation? Regardless of how pretty the house was. live[ebay] [Speedy Bags] Louis Vuitton Speedy 25 Louis Vuitton Speedy 30 Louis Vuitton Speedy 35 Louis Vuitton Speedy 40 |
