Coach Handbag Serial Number Check
Coach Wallet Serial Number
Of course there's more to deciding whether or not a Coach bag or other accessory is counterfeit than just the serial number. You also have to look at the construction details like zipper pulls (but NOT the zipper brand, which can never prove something's genuine!), hardware, stitching, the design and thickness of the straps, the design and font used on the creed stamp or creed patch inside the bag, and especially whether the style number (the numbers to the right of the dash) on the creed actually belongs to that style bag. Also beware of badly-researched or Copied-and-Pasted 'Guides' posted here and at other places on the Net that quote 'Rules' and claim that a certain feature like YKK zippers prove a Coach is real (or fake). Coach has used almost a dozen different brands of zippers, and fakes makers can buy real OR fake YKKs so a zipper doesn't prove a thing). 
Almost all of them are filled with mistakes, outdated info or just plain nonsense. There is NO single detail that can ever prove a Coach is genuine. 