Santana Fossil

I have possession of a rare fossil. It is Araripelepidote from the Semianotiforms. I have done some research and comparison to others only by photos. As far as I can tell, it has not had anything done to it at all, it is original. It is the whole stone, professionally split and both sides of the fossil are without blemish and untouched. It's a magnificent 3-D specimen, approximately 16.5" x 5.5" in it's full effect. The so-called armor and scales are exquisite. I would like to know who can appraise it for me. Since it is banned, most museums will only tell me what it is, and the fact that they say they are not in the business of appraisal. Although, they have asked me to donate it. I know what one sold for, and mine looks just as good. I would appreciate any information you can give me. Thank you.