[Drdogface]

The most common bayonet in Civil War (War for Southern Independence) times was the triangular one with no sharp edges. The attachment to the bbl was a round base which slipped over the bbl and rotated to lock in place. There was also on some rifles, a sabre bayonet some with ominous curved blades..pretty long. The handle of these had a recess which slipped over a fitting on the side of the bbl.

The one you found looks to be much shorter in length than either of the ones I mentioned but beyond that a suggestion of it's date would be only a guess.

Perhaps Tabs will see this post of yours and, if so, will know tons more about it. Jeff Higgens would as well as well.