Thank you. I knew the ring on the zipper was wrong but I thought that maybe it had been replaced.All the issues you mentioned should be more than enough to prove your case - that and the simple fact that Coach has no records of making any genuine bags with Bean Bag creeds. You also have genuine bags to compare it to. And vintage Coaches would ONLY have used solid brass hardware - you'll NEVER see a genuine vintage Coach zipper and zipper pull that look like that.
The underscore and shape of the "o" in the "No" before the serial number isn't right either.
Good news! The seller just got back to me with an apology. She realized that this wasn't the purse she bought at Coach, but one of her mother's. She found the one she meant to sell and is sending it to me, so I am thrilled!