Coach Serial Numbers - the Basic Facts *by “Hyacinth” for Salearea Coach serial numbers can be confusing, and are constantly changing. They, along with the creed patch or stamp (that thing that begins “This is a Coach Bag.” stamped inside every full-size Coach handbag and some but by no means all accessories like Pouches, Swingpacks, and other smaller items) are also the most useful and dependable parts of any Coach bag in helping determine age, style, origin and especially authenticity. Unfortunately there's so much misinformation about serial numbers that it's getting harder and harder to find accurate information. Young money rise of an empire torrent. Many so-called 'authenticity guides' spout that all serials must follow such-and-such a rule, which is absolute NONSENSE. Serial numbers rolex.