Please help me authenticate this small Stam/Cecilia. Thank you for your time

Item: Marc Jacobs Stam Cecilia Quilted Blue Leather Chain Kisslock Shoulder, EUC
Listing number: 142763510238
Seller:
sydney19622
Link:
https://www.ebay.com/itm/Marc-Jacob...e=STRK:MEBIDX:IT&_trksid=p2055119.m1438.l2649
Comments: I have been looking at Stams a lot lately and haven't seen a Cecilia with a kisslock, except for another Ebay listing (it had the slanted outside pocket zipper like this one), and was wondering if it's authentic. I thought Stams had the horizontal zipper and kisslock, and the Cecilia had the slanted zipper and a zip closure, but again I'm pretty new to the brand in terms of knowing all these details

Additionally, I have requested pics of the season tag and can post them when I get them.