[eBay] how do you know if a NFL jrsy is real or fake?

If you are seriously considering buying it then the jersey if fake.

 

Best indication of whether it is fake or not is if the seller is in a foreign country.
Another sign it might be fake is if they don't ever say it's authentic.
I think that one is legit, especially since it is a top-rated seller (another thing to look for) and in that listing it says it's authentic.
Buy it.

 

Damn, dude. Do you smoke pcp, or do you troll so many forums that you can't remember threads you've already started?

http://bbs.clutchfans.net/showthread.php?t=204601&highlight=jerseys