Guess I'm going to have to eat a little crow in my grits in the morning as technically they maybe all Napoleon's but I IMHO, E is a hybrid and was made in the late war at Tredegar. In the late war bronze was in short supply in the South so in order to make this type gun in Iron, they had to add the big ole breach in order for the metal to hold up during firing just as they did with the Parrott which was made of iron.