Not a one off. I have this exact bass hence why I'm here. I need info on it as well.Looks like a custom bolt-neck inspired by BC Rich and Warwick in parts - seems to be well-executed with good quality parts. Almost any small luthier could have done it, or it might even be from one of the small asian production lines. More pictures of the back (and back of the headstock) might provide more clues... Logo isn't Samick or Sadowsky..
##EDIT: just beat me to it with the pics!
I'm drawing a blank, but its almost certainly a luthier's custom one-off