An Ottoman jambiya, this piece likely dating to the late 19th century or first decades of the 20th century. This is an interesting piece with a finely tooled scabbard.
The hilt is made of horn and copper rivets. I have another jambiya almost identical (slightly shorter) which can be had as part of a group deal with this one.
This piece can be yours for £120 or best offer, this can be purchased with the near matching one for £180.