I'm pretty new to the artillery side of collecting and would appreciate any help or opinions. This fragment was found many years ago on the Alabama coast in an area that it could be Confederate or Union even possibly naval. Sketching it out, the outer diameter would be right at 4 1/4" and the inner diameter of the fuse hole would be just under 1 1/2". The threads are 5 or maybe 6 in 1/2" area. Any help with this would be greatly appreciated.