View attachment 1919504
Some of the civil war buoy knives I googled have a similar cross guard design. Cool find, are the two notches a makers mark?
Not a gun part... it is the brass crossguard from a civil war era British-made Sheffield fighting-knife. We know, because they've been found on civil war Blockade-Runner shipwrecks, such as the "Modern Greece."
That photo is of a fake bowie, modern made. Real bowie but modern fake if it is represented as CW, and the guard is nothing like the OP guard.