Kindjal, filigreed sheath.

[ALEX]

Originally Posted by rockelk

... Could this be black niello in the background with the silver polished? Has anyone seen a sheath done in this fashion? ...

As Ariel noted, this is a modern kindjal. It is of white metal, they mostly use 'melchior alloy' which is mix of copper and nickel, or alpaka - another white metal alloy that visually resembles silver but has no silver content. There is also no niello at the background, it is painted or etched to a dark shade.
There are many modern daggers and swords of various quality being made now, mostly in Caucasus region. Of interest to this thread, here is another modern kindjal made in Georgia. Please note the carvings, niello-like decorations, beadwork and especially to note - the complex filigree on the back side of the scabbard. Even though it is hand made - nothing in it is real. Also, notice the number '3' stamped on the scabbard, a mark which Ariel already mentioned above.