The cue looks very similar to the Joss N8 though yours has 4 veneers rather than 3, like some of the higher numbered "N" cues. It was made in the late 80's early 90's, so if the cue is straight at this point it just may stay that way. I'd guess the original list was probably around $700 - $750.
I'd highly doubt there is ivory in the cue. I'd guesstimate the value around $300 - $350. They are good players with a nice stiff hit.