There is no fast and hard rules. Different shirt, different batch, different manufacturer, different eras - all display different characteristics and traits.

You can post pics of tags, labels, shirt etc for memebrs to verify then u will learn the traits as well and slowly know the basic rules or norms.
OT: Faiz, I suggest you put a note on the very first thread / FAQ for benefit of newbies on this cos lately a lot of this same identical question posted.

OK, will do later... I've been asked via pm the same question many times as well...
Just share the link of that site with us here. We have many experts who can check for you and advise if it's authentic or not.

There is no straight forward guide on how to tell if a jersey is fake or not. There are TOO many different characteristics that are unique and different from one and each other.. especially from different brands and manufacturers as well.

If not mistaken...Nike red label meaning sizing is L.... 
your barca authenthic what size?

Your shirt looks ok to me, did you check the number on the swing tag tally with the small label beneath the washing tag? 

All the authentic jerseys that available for retail sale to general public we call it as replica jersey, its official released by the brand manufacturers, those use by player in actual match with some difference we call it as player issue jersey.

tag code start with no.3 not necessary means its a replica jersey

@branislave: I understand what you are referring to. The silver lining looks too glittery but i'm not sure if its due to the camera/lighting.

@ra2zy:Take a look at your jersey's silver lining.
Mine has tiny inscriptions which says "To every footballer in the world" (sorry the fonts are just too small for my camera to capture)

Also, if you are still in doubt, share with us the source you got your jersey from.
That should help abit more.

Yes, the tiny inscription is inside the hologram.

Price too good to be true at RM140 , is the Barca pictures that you put up previously were sent by that mudah seller? If so, i guess he might be using the authentic shirt pictures to deceive you

The seller name of alonso looks familiar with a fakers here previously, couldn't really recall the name though, he has the authentic Barca shirt on hand too.

im afraid the inscription really has to be inspected on the spot as it is really small.
you would really have to squint your eyes in order to decipher the "to every footballer in the world" sign.

I'm not familiar with the source, cant comment on it sorry.

sorry, my bad, the previous fakers is call kaka_89 here

not necessary, most of the so call AAA grade fake has barcode label on their tag too, you couldn't rely on that only. There are many other experts here who can help you, just they yet to answer your doubts, i am just amateur only 

haha, depends on where you buy it, if you buy at nike, adidas, puma store respectively, you don't need good knowledge also no problem

As mentioned earlier, the inscriptions are too small to be taken with a camera (or at least mine isn't sharp enough)

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Added on January 8, 2011, 11:35 pmHi guys, does anyone know the difference between 08/09 and current season UCL starballs?
I was told that 08/09 starballs are lextra with plastic whereas the current ones are senscilia w/o plastic
Aesthetically, is there any other noticeable differences?

Here you go!

indeed it looks different. just look at the length of the sliver line, it shouldnt be touching the side of the black square.

@Gary, it should be the same. i dont have the senscilia ones yet but i havent heard anyone said its different nor any shops sell them differently.

You should read the first page of this thread, as what I wrote under the thread's title...
If not mistaken, in EPL.. you can change squad numbers given that the number is vacant at any time of the season. Blanc got 6 when stam left suddenly in 2001-2002 season... as long as the number becomes vacant when the player is loaned or sold... it can be used. But permission needs to be requested by the Premier League.
It looks fake to me, especially the AUTHENTIC tag.
And judging by the other jerseys this seller sells at mudah... they all look fake.

RM140 is TOO GOOD to be true.. Seriously..

Just take one example of other jerseys this seller is selling at mudah, Arsenal Away 2010-2011..

Source: http://www.mudah.my/Arsenal+Original+Away+...011-8180399.htm

Look at the washing tags:

A bit blurry but... besides the korean (K) and chinese © sizing... there is no measurement!

Fake.

And this seller also sells a limited edition spain world cup winners jersey!

Source: http://www.mudah.my/Spain+world+cup+editio...nal-8180361.htm

But wait... look at it's barcode sticker on the price tag:

Is that 'REAL A JSY' written on the barcode sticker? That barcode sticker was suppose to be for Real Madrid's away jersey?

Fake!

One good tip to learn if you want to buy from a certain seller.. try to check other jerseys that the same seller is selling...

Another thing is.. always play safe and buy from reputable sellers.. kitbag, subside... or al-ikhsan & real one... you pay a bit more.. but it's authentic.. safer. Puas hati.

Cheers!

the japan shirt looks really good with this Asian Cup patches...