I'm in love with an Hermes crocodile birkin on eBay...well, actually all of them However, I was not sure exactly how to know whether one being sold is authentic. The major difference I have seen is the zipper. Should the zipper (the part you pull) be leather or crocodile for authentic croc birkins. I'd thought I ask as I am sure there are some true experts on the site. That way, I'll know who to bypass and who sells the real deal. Thank you so very much to all who can help me. I grately appreciate it.