There are a lot of fake Gucci bags online given the fact that they  are so sought-after nowadays. So either if you’re looking for the real  deal or good Gucci replica bags, I think these Gucci authenticity tips will help you out.
 Gucci Authenticity – Common Features

First of all, let’s start with the inside tag. All Gucci bags except  the vintage ones feature a leather inside tag with the “Gucci Made in  Italy” stamp on it and a registered trademarked circled “R”. So getting  to know the font, deepness, spacing, positioning of the logo and that of  the circled R really well will prove to be extremely useful for many  Gucci styles. First of all, you need to make sure the font is correct  and that the letters don’t touch each other. And here’s an interesting  Gucci authenticity tip: the left side of the “U” in Gucci should be  thicker than the right. But you should also check the letters “G” and  the two Cs carefully. 

Another interesting thing about this leather tab/label is that the  seams across it match the color of the lining, not the color of the  leather! But on any other leather trim on the bag the stitching should  match the color of the leather. 
Authentic Gucci Padlock Blooms Shoulder Bag Tag Stitching
Authentic Gucci Padlock Signature Bag Inside Tag Stitching Color
The serial number should be on the back of this leather tabs and  feature two rows of 6 numbers that are embossed close together. Make  sure both rows are centered. Again, this rule does not apply to vintage  Gucci bags!
 
 Gucci Serial Number Font and Format

Gucci replica bags have really blossomed this year, with all the new  beautiful designs that have been released. The already iconic Dionysus  bag, the Sylvie bag, the GG Marmont bag or the Gucci Padlock bag and all  their numerous variations are some of the most coveted replica bags of the moment. 


As I’ve told you before, if you’re trying to learn more about Gucci  authenticity, the first site you should start your research with is the  official Gucci site. They are quite generous with the pictures they show  of each bag, which is really useful if you want to study the details of  a certain Gucci bag.
 If you are interested in Monogram Gucci bags, then the first thing  you need to check is the Monogram GG canvas, of course. And here are  some Gucci authenticity tips for you: even though the two Gs face each  other and are really close, they should not be touching. Then you can  notice that the horizontal line of each G forms a shape that looks like a  triangle (reversed for the left G). 
Gucci Authenticity Tip: Monogram Canvas Unique Detail
The same rules apply to the Gucci Guccissima leather as well. But  please take into account that even though some guides say that the  Monograms should line up even where the sides are stitched together,  this is not true (just like in the case of the Monogram LV bags). What  is true though is that the GGs will be the same throughout the handbag,  which means the letters will have the same size, shape and font.
 Here’s the bottom of the Gucci GG Supreme duffle bag. Notice how the  monograms don’t line up around the stitching? Just so you know, I took  the photo from the official Gucci site: 
Authentic Gucci GG Supreme Duffle – Monogram Are Not Symmetric
I know there are a lot of articles on how to check Gucci authenticity  online and that can be confusing. Please keep in mind that many of  these guides were written years ago, so some of the information there  might not apply to new Gucci styles. Let’s take the fake Gucci duffle  bag for example because I know this is still one of the most popular  styles from the brand.
 Finding cheap Gucci luggage used to be easier before for a reason.  The Gucci Duffle bag made of canvas had textile lining and therefore the  costs were not very high either. But things are different with the new  Gucci duffle bags. The interior is made from “microfiber lining with a  suede-like finish” which is harder to copy and also more expensive. So  if you’re looking for cheap Gucci luggage, maybe you should stick to the  older pieces. 
New Gucci GG Caleido Duffle Luxurious Lining
You should, of course, check to see if the stitching is smooth and  even. If you find uneven or sloppy stitching, the bag is probably a  fake. Another general Gucci authenticity tip is to check the hardware  engravings: clasps, zippers, bottom stud, hooks or any other engraved  piece of hardware. The engraving should be clean, clear and the weight  of the hardware is also important because authentic Gucci hardware is  made of solid metal, so it should be on the heavy side. Needless to say  that authentic Gucci hardware doesn’t rust or chip off. 
I’m sorry I wasn’t able to offer more tips on Gucci authenticity for  vintage bags. But I don’t feel like I have enough information, so I  think it’s the right thing to do.