The 650B has the orignal knobs, and yess it I would play it with a wide strap, (my friend says you can make it sound like stanley clarke.).its pretty indestructable, and the neck will stay true allways,.who makes such necks these days
Late 70 s rare bass, very little signs of wear, in good working order, with original case.
See specs amongst the pictures, there allso info on the net and a youtube video of one somewhere.