Tatiana,
So good to see you back! You always bring such unconventional things!
As to you dagger with bone handle and para-i-tutti-ish blade, I couldn't help but notice a very peculiar bolster: kind of "staircase-like" ( for want of a better comparison).
It eerily reminds me of Adya Katti, from Coorg/ Malabar area.
Here is a reference to it from Artzi's collection and every other example he has on his site shows the same thing ( just go over them):
http://www.oriental-arms.com/item.php?id=1520
What would we do without Artzi/Avner's site?