In your first post, you said it weighed 1.11 pounds. Now that you've corrected that to 1 pound 11.4 ounces (a major difference), I can say with certainty that it is a Solid (not hollow) ball. That, of course, excludes it from being an artillery projectile or grenade.
The projections on opposite sides from each other make me think it was mounted on something. Perhaps it is a piece of Ornamental Ironwork, such as part of a fireplace andiron.