How to authenticate a YSL Saint Laurent bag at the store? Is it

Saint Laurent quilted, overstitching calfskin leather crossbody bag. Adjustable shoulder strap with removable leather tassel; 23 drop. Zip-around top closure. Exterior, removable hanging tassel at side. Signature YSL black metal hardware at front. Interior, one slip pocket. Grosgrain lining. 6.2H. 9W x 2.3D. Item weighs approx. 1.1 lb. / 0.5 kg. Dustbag and authenticity card included. Made in Italy.

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