Hi Julien:
Welcome to the Forum!
Nobody has responded to your question yet, and I suspect that is because very few people own one of these swords. I have handled only one, and that was many years ago. They are extremely hard to find and even harder to purchase.
There are some commercial web sites that may have examples among their archives. In this regard, I would suggest that you look on the Oriental Arms web site and other sites featuring ethnographic swords that are listed on this site
here
Ian