I have occasionally seen Willis bags with a style number FO9927 instead of 9927 - but the bags don't look fake to me. Here's an example of a FO9927 bag at the link below that was sold on Tradesy, do you agree that it is authentic? If so, can you explain the reason or the FO designation in the style number? Thanks!
https://www.tradesy.com/i/coach-willis-crossbody-shoulder-black-leather-messenger-bag/25238769/
https://www.tradesy.com/i/coach-willis-crossbody-shoulder-black-leather-messenger-bag/25238769/