What is this????? Civil war item?

[Depths Of History]

Lund this today at a civil war tearout driveway zone.
Any ideas.
Found in a big civil war place
Found about 10 inches deep

 

[Depths Of History]

There nearly HAS to be markings on it. Companies that would have made this would be making many similar items, and would need to be able to be sure they had the right one (so at least a part number). And they would want to take pride in their quality manufacturing (so a likely makers mark). I can understand being hesitant to clean immediately, but I don't think you'll lose any value by removing some of the beautiful patina it has built up. We can rule any direct Civil War application.

Maybe.
How can I clean it. Brass