great guesses.
Here are some more clues.
The claw marks are cast in the iron and all go in the same
general direction.
The rim tapers from left to right and is overhung a bit.
There seems to have been a hole cast (see half of it).
Perhaps for a bolt.
The circle to the extreme left shows an area where the
thinner side may have been mated to another section.
If it is a weapon DC, I think you would have to drop it
from a tree on an animal's head or backbone.
Zuma