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It is a beautiful vintage Louis Vuitton pochette. Such designer brand handbags are being offered at auction on a regular basis.
It is a lovely Louis Vuitton Cherry Blossom Monogram Canvas pochette made in a limited edition collection from 2003. The design is by the Japanese pop artist, Takashi Murakami, who wanted to bring some freshness and cheerfulness to the iconic monogram pattern and thus the Cherry Blossom Monogram Line was created.
It appears to be in very good condition without any major signs of wear or use apart from the spot on the interior. The condition is important to potential buyers. The original receipt, box and dustbag will add to the value if you happen to have these as well.

I believe that the pochette would attract the attention of both collectors and dealers if it came up for auction.
The estimate provided is for a well-advertised specialised online designer brand auction, where I believe the Louis Vuitton has the best chance of realising its fullest potential. However, there is no measurement for the sentimental value you might attach to the limited edition pochette. Retail "asking prices" can be higher and vary.

Please let me know if you have any additional questions. I’m happy to help.
Thank you