There are no identifying marks on this piece and since I am mostly a glass collector.. I can only assume (Don't say it lol) that this is ironstone?
I have looked at sites on the ways to tell if it is ironstone and the tureen seems to fit the requirements.
Heavy, non translucent and has a nice 'ring' to it when tapped with a fingernail.
I understand that not all Red-Cliff was marked .. could this be that?
Thank You Everyone