I have what looks like a cannonball. It is spherical, cast iron with two cylindrical cavities. It is about 22 pounds and 5.8 inches in diameter. The major cavity is 2.4 inches diameter by 2.5 inches long. The minor cavity is 0.81 inches diameter by 2.8 inches long. The cavities are stacked on the same center line. It also has a large depression which I have seen in French cannonball photos. Please take a look at the attached photos and offer your opinion.