Yannis:
Gorgeous Vietnamese sword. Clearly modeled after a Chinese jian, but the blade seems more European in style with the ricasso. The central rib is also unusual for a Chinese blade. The finely inlaid decorative work on the scabbard resembles that seen on some of the so-called "parade sabers" from Vietnam in the 19th C. There are pictures of the latter on the Oriental Arms web site.
Just a lovely sword and quite rare. I know that you have just acquired it after pursuing it for some time, but if it should ever need another home ... well, you know, just give me a call ...
Ian.
Here are two examples from the Oriental Arms web site of Vietnamese swords that sold some time ago. The top one also has an elephant molar tooth for the handle and has silver mounts similar to your example.