I found this item on the beach in Cromer, Norfolk, when I was a child, about 20 or more years ago. As a child, I believed that this was a whale tooth! I recently found it again in a box of my things at my mums house, and am now wondering what it is? I think it is definitely a bone of some sort, although I could be wrong. I don't know if you can tell me anything from the photos? It is approximately 2" across on each side.