Dagger, child dagger, “kiddney dagger”?
 

A small dagger, engraved with initials, handle made from bone plates intertwine with brass, very nice thing.

If someone knows more about it?

You have not included a ruler/tape measure.
At first I thought such elaborate, delicate detailing might indicate a woman's piece, but it seems it is intended for outer carry (the belt loop) so I don't know.
Measurements might help.
Fine and fascinating weapon... and very effective.

Hy, i dont know if that is a belt loop, it is small, around 14-15 cm in total lenght with scabbard, and that metal loop is small, if it is for a belt, then a small one, thats why i thougt it is maybe childs?
Im on the go, so i cant take photo, but i mesured the dagger before it is between 14-15 cm.

Maybe it is womans dagger, or childs?
It reminded me on a kidney dagger, a gamblers or prostitutes dagger, but monograms, it leans more toward something a military face child would have, maybe from Austro-Hungary, or Croatia?

question
 

I agree, I did not realise it was so small. Let's see what everyone else's opinion is.