To have it appraised, costs money. A musuem curator will NOT appraise that for you. Yeah, he will most likely refer you to someone else. You can go to the International Society of Appraisers, and go that route. Not worth spending that kind of money. Either find an antique dealer to help you, or, do your own research on it, and find a close price.
There is a a difference too, between book value, and what someone is willing to pay for it. If it's not rare piece, or hard to find piece, I doubt you will get book value.