glenna place to startFri Mar 30 17:18:02 2001 You need to do a few measurements on the tube, maybe make a drawing. You may find that its of the period of the War Between the States and maybe not. A good place to start is the Civil War Artillery Site. Try to get a good drawing or photo of your tube and do a little comparing. Check it out at: http://www.cwartillery.org/artillery.html