Here are 3 additional pics. The first is the raw log on the lathe so you can see the pith is right about where the tail center is. I believe the end you see ended up being the base. The second pic shows the growth rings the best, it was taken right after the form came off the lathe while the wood was still naturally wet. The grain direction is straight out the top of the piece. It just happens where the fractures formed was facing away from the camera, but the lines were visible back then, but didn't appear to be cracks. The third pic is when I just wetted the top, but the growth rings are hard to see, but they are concentric around the hole in the top.
I'm pretty sure this log was the trunk of the tree, but it was a relatively small tree.