The zipper pull and leather pull tab aren't right (and what color is the zipper pull, brass or silver?), the
Coach logo on the creed is an older style that had just been replaced by the one with thinner lettering, and after looking at the creeds of almost a dozen other bags from the same plant, month and year none of the other creeds have the same font in either the serial number or the creed itself. The letters and numbers in yours are much wider than all the others.
The turnlock also looks crooked in your photo and looks a little lopsided in the seller's, with the pocket flap being shorter on the left side than the right although that may just be the camera angle. None of these are solid proof that it's fake but the creed and serial fonts raise serious questions. I've posted one of the "regular" H5D- creeds below for comparison.