The computer illustrations provided were reviewed by myself, but they lack a nomenclature form where in wording, it would point out the body being Iron, with a lead covering over 3/4 of it. I provided the link with a primary photo of the shell to make sure we both were understanding one another. Sorry for the misunderstanding.
However despite taking upon myself to figure out what this was, the key question that still remains unanswered is whether or not this pattern of shell was used in the Civil War by the North or South.......has it been documented, or yet to be??
As of now I haven't been able to locate a source that it has.