This one is a CAC imho.
Of course, I appreciate all opinions and hope to see some more.
This one is as found with no polishing evident imho.
The thing is--given the history, a lot of these killer CAC were found in a river (buckets full) and many were in mint condition as found.
If you have 100 of these--post some more and I am glad to see what you have and give an estimation of the maker.
Nice marble!
Marble--On!!