That's for KOTOR1?
And it really depends on which line it is. Naga Sadow's tomb also had an unique sword in it.
Don't know anything about an unique sword in Nadd's tomb (but there is the unique shortsaber, and with 1.8 the armband and that other one I don't recall atm ).
EDIT: Just checked, and the StrRef you mention is blank in KOTOR2, so it must be KOTOR1.