If I had this and was trying to sell it, assuming it's super straight and there are no noticeable dings in the finish or shaft, I'd probably price it around $300 to gauge interest. If it sells immediately, great. If I have to entertain offers, so be it.
For the "it's just a Dufferin" crowd. It's a Dufferin donor/blank that's had a butt cap, a joint collar, a shaft collar, a pin, and an upgraded shaft added to it. People would be tripping over one another to buy that cue for $300 if Dennis Searing had so much as breathed on it.