Thanks to everyone for their erudite contributions. I guess the concensus is that it is a Balkans/Yugoslavian Gusle or Gusla.
Malcolm, I might try to put a gut string on it as the horsehair string and horsehair bow don't really do much. I'm inclined to agree with Guest (whose uncle used to play one) - it is a bloody awful noise - atleast in my hands. I don't have a lot of interest in playing it seriously. I bought it because I was intrigued by the intricacy of the carving and the horsehead on the head of it and the seals? on the bow. Someone put a lot of hours into this piece.
Fiosrach, if I decide to put it up on eBay, I'll resurrect this thread to let you know.
Thanks again.