Cannonball ID

[meals55]

I took a chance and won what was listed as a Civil War cannonball. I am in it for $47. I am not an artillery guy so need some help identifying this ball as authentic. Also is it Civil War or another period. I took some pics and measurements. Postal scale is exactly 12lbs 4oz. I did my best with outside spring calipers and digital calipers and got a diameter of 4.497". On examination it has a fine mold seem. I believe there is a sprue mark in the seem and also at 90 degrees. I took pictures of what I think are the sprue marks. Is the Cannonball Guy still on this forum? Any help would be appreciated!

 

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[geologyjohn]

Looks like a nice Mexican War to Civil War 12 lb. solid shot cannonball. A nice score at that price. Good job!