Hello Carlos, You haven't mentioned if you won this or not. I will jump in with trying to date it and say 1890 to 1930. Its the belt loop on the sheath that makes me wonder about dating it as most earlier ones were still using a frog for suspension. It could also be that the original owner had it especially made like this.
I would like to see better photos of the engraving on the silver inserts in the hilt before making a comment on where it could be from. Like everyone else I was also watching this with great interest. Congratulation to you if you did win this beautiful dagger and my condolences if you did not.
Regards,
Robert