This is a Louis Vuitton Musette Tango. I purchased it over 10 years ago, so I don't have the receipt, but it is an authentic item purchased at the Louis Vuitton Kobe Motomachi store. Serial number SP0041 (see image 9). The area of concern is shown in the 10th photo. There are stains and a 5mm ballpoint pen mark. To prevent product substitution, returns are not accepted after purchase. Please review the images carefully before purchasing. Please feel free to ask any questions in the comments.