I ran into a couple of women at the mall wearing a fake TB cross body and the noticeable differences were: first of all the style of the cross body, but if you are not familiar with the TB styles over the years you cannot miss the oversized round "reva" type logo that looked like it was made of shiny plastic. As far as pictures (ebay, posh etc.) I think look at the logo (you can tell from a picture that it is metal, not plastic), the stitching and the piping detail. The piping is the rubber-like material that seals the ends of the handles and edge of the seams of the bag.