Are there any stamps or logos of any kind on the inside? If it's the same style and age as one that Rie1234 had, it may be too old even to have a serial number.
Coach has made other double-sided bags but I haven't seen this one before. Maybe another poster will recognise it.
There is NOTHING on the inside serial number wise, but the quality of leather, stitching, etc. give me hope. Were the tiny Coach tags glued on? or how were they attached?
Thanks for your help, I've read 138 pages of AT so far, and look forward to many future authentications.